Costume Upgrades

Based on how costumes work in many Chinese PvZ games, as well as the leaked experimental plant leveling system, Costume Upgrades are a way to make a plant stronger, and for plants with two or more costumes, in varying ways.

Basic Mechanics
Through a yet-unconcieved menu system (potentially from the Travel Log?), a player can activate a quest to level up a costume. Leveling up a costume at random gives an easier quest, while a specific one gives a harder quest.

Quest Mechanics
For specific costumes, the amount of levels in the quest is equal to the level you're trying to get the costume to. Difficulty scales depending on the level, with Level 1 quests usually being of medium difficulty. Non-specific quests randomly have between two and four levels, and their difficulty scales based on the total level of all costumes, but not very quickly.

Costume Mechanics
Costume effects for a plant only apply to when that costume is active on the plant. All costumes are Level 0 when acquired.

Blue Mask
Level 1: 3% faster arming time (14.55 seconds)

Level 2: 5% faster arming time (14.25 seconds)

Level 3: 8% faster arming time (13.8 seconds), +1 health when arming (5 health)

Level 4: 10% faster arming time (13.5 seconds), +2 health when arming (6 health)

Level 5: 12% faster arming time (13.2 seconds), +3 health when arming (7 health)

Level 6: 15% faster arming time (12.75 seconds), +4 health when arming (8 health), 2% higher damage (91.8 damage)

Level 7: 20% faster arming time (12 seconds), +6 health when arming (10 health), 4% higher damage (93.6 damage)

Level 8: 28% faster arming time (10.8 seconds), +12 health when arming (16 health), 8% higher damage (97.2 damage), deals 10 damage to non-zombie obstacles in a 3x3 radius

Level 9: 35% faster arming time (9.75 seconds), +20 health when arming (24 health), 15% higher damage (103.5 damage), deals 20 damage to non-zombie obstacles in a 3x3 radius

Max Level: 50% faster arming time (7.5 seconds), +32 health when arming (36 health), 25% higher damage (112.5 damage), destroys non-zombie obstacles in a 3x3 radius

Googly Glasses
Level 1: 2% faster arming time (14.7 seconds)

Level 2: 4% faster arming time (14.4 seconds)

Level 3: 6% faster arming time (14.1 seconds), explosion hits 0.05 tiles further

Level 4: 8% faster arming time (13.8 seconds), explosion hits 0.1 tiles further

Level 5: 11% faster arming time (13.35 seconds), explosion hits 0.15 tiles further

Level 6: 14% faster arming time (12.9 seconds), explosion hits 0.22 tiles further

Level 7: 18% faster arming time (12.3 seconds), explosion hits 0.33 tiles further

Level 8: 25% faster arming time (11.25 seconds), explosion hits 0.45 tiles further, 5% higher damage (94.5 damage)

Level 9: 33% faster arming time (10.05 seconds), explosion hits 0.72 tiles further, 10% higher damage (99 damage)

Max Level: 47% faster arming time (7.95 seconds), explosion hits 0.99 tiles further, 18% higher damage (106.2 damage)

Sweatband
Level 1: 3% faster firing rate (2.91 seconds)

Level 2: 5% faster firing rate (2.85 seconds)

Level 3: 7% faster firing rate (2.79 seconds), 2.5% higher damage (2.05)

Level 4: 12% faster firing rate (2.64 seconds), 5% higher damage (2.1)

Level 5: 15% faster firing rate (2.55 seconds), 7.5% higher damage (2.15)

Level 6: 19% faster firing rate (2.43 seconds), 10% higher damage (2.2)

Level 7: 24% faster firing rate (2.28 seconds), 15% higher damage (2.3), +2 health (6)

Level 8: 30% faster firing rate (2.1 seconds), 22.5% higher damage (2.45), +4 health (8)

Level 9: 40% faster firing rate (1.8 seconds), 30% higher damage (2.6), +8 health (12)

Max level: 50% faster firing rate (1.5 seconds), 42.5% higher damage (2.85), +16 health (20)

Tiara
Level 1: 1% faster firing rate (2.97 seconds)

Level 2: 2% faster firing rate (2.94 seconds), +1 health (5)

Level 3: 3% faster firing rate (2.91 seconds), +2 health (6)

Level 4: 4% faster firing rate (2.88 seconds), +4 health (8)

Level 5: 5% faster firing rate (2.85 seconds), +8 health (12)

Level 6: 6% faster firing rate (2.82 seconds), +16 health (20)

Level 7: 7% faster firing rate (2.79 seconds), +28 health (32)

Level 8: 8% faster firing rate (2.76 seconds), +46 health (50)

Level 9: 9% faster firing rate (2.73 seconds), +60 health (64)

Max Level: 10% faster firing rate (2.7 seconds), +71 health (75)

Jamaican Beanie
Level 1: 5% higher damage (1.05)

Level 2: 10% higher damage (1.1)

Level 3: 16% higher damage (1.16)

Level 4: 25% higher damage (1.25), boomerangs hit 1 more zombie

Level 5: 35% higher damage (1.35), boomerangs hit 1 more zombie

Level 6: 48% higher damage (1.48), boomerangs hit 2 more zombies

Level 7: 60% higher damage (1.6), boomerangs hit 2 more zombies

Level 8: 80% higher damage (1.8), boomerangs hit 3 more zombies

Level 9: 100% higher damage (2), boomerangs hit 4 more zombies

Max Level: 125% higher damage (2.25), boomerangs hit 5 more zombies, costs 25 less sun (150 sun)

Earmuffs
Level 1: 5% longer freezing time (10.5 seconds)

Level 2: 10% longer freezing time (11 seconds)

Level 3: 15% longer freezing time (11.5 seconds)

Level 4: 22% longer freezing time (12.2 seconds)

Level 5: 35% longer freezing time (13.5 seconds)

Level 6: 50% longer freezing time (15 seconds)

Level 7: 68% longer freezing time (16.8 seconds), able to freeze Frostbite Caves zombies for 1/3 the time (5.6 seconds)

Level 8: 90% longer freezing time (19 seconds), able to freeze Frostbite Caves zombies for 1/2 the time (8.5 seconds)

Level 9: 125% longer freezing time (22.5 seconds), able to freeze Frostbite Caves zombies for 2/3 the time (15 seconds)

Max Level: 175% longer freezing time (27.5 seconds), able to freeze Frostbite Caves zombies for the full time

Brown Checkerboard Earmuffs
Level 1: 2% longer freezing time (10.2 seconds)

Level 2: 4% longer freezing time (10.4 seconds)

Level 3: 6% longer freezing time (10.6 seconds)

Level 4: 8% longer freezing time (10.8 seconds), able to freeze 1 more zombie at a time

Level 5: 10% longer freezing time (11 seconds), able to freeze 1 more zombie at a time

Level 6: 12% longer freezing time (11.2 seconds), able to freeze 2 more zombies at a time

Level 7: 14% longer freezing time (11.4 seconds), able to freeze 3 more zombies at a time

Level 8: 16% longer freezing time (11.6 seconds), able to freeze 4 more zombies at a time

Level 9: 18% longer freezing time (11.8 seconds), able to freeze 7 more zombies at a time

Max Level: 20% longer freezing time (12 seconds), able to freeze an entire square of zombies at a time

Fez
Level 1: destroys graves 4% faster (2.88 seconds)

Level 2: destroys graves 8% faster (2.76 seconds)

Level 3: destroys graves 12% faster (2.64 seconds)

Level 4: destroys graves 16% faster (2.52 seconds)

Level 5: destroys graves 20% faster (2.4 seconds)

Level 6: destroys graves 24% faster (2.28 seconds), recharges 6% faster (9.4 seconds)

Level 7: destroys graves 28% faster (2.16 seconds), recharges 12% faster (8.8 seconds)

Level 8: destroys graves 32% faster (2.04 seconds), recharges 18% faster (8.2 seconds)

Level 9: destroys graves 36% faster (1.92 seconds), recharges 24% faster (7.6 seconds)

Max Level: destroys graves 40% faster (1.8 seconds), recharges 30% faster (7 seconds)

Blue Sunglasses
Level 1: produces sun 2% faster (23.52 seconds)

Level 2: produces sun 4% faster (23.04 seconds)

Level 3: produces sun 6% faster (22.56 seconds)

Level 4: produces sun 9% faster (21.84 seconds)

Level 5: produces sun 14% faster (20.64 seconds)

Level 6: produces sun 20% faster (19.2 seconds), recharges 2% faster (9.8 seconds)

Level 7: produces sun 27% faster (17.52 seconds), recharges 4% faster (9.6 seconds)

Level 8: produces sun 35% faster (15.6 seconds), recharges 8% faster (9.2 seconds)

Level 9: produces sun 44% faster (13.44 seconds), recharges 15% faster (8.5 seconds)

Max Level: produces sun 54% faster (11.04 seconds), recharges 25% faster (7.5 seconds)

Boxing Champion Belt
Level 1: Deals 6% more damage (0.795 damage)

Level 2: Deals 12% more damage (0.84 damage)

Level 3: Deals 18% more damage (0.885 damage)

Level 4: Deals 24% more damage (0.93 damage)

Level 5: Deals 30% more damage (0.975 damage)

Level 6: Deals 40% more damage (1.05 damage), +2 health (6)

Level 7: Deals 50% more damage (1.125 damage), +4 health (8)

Level 8: Deals 64% more damage (1.23 damage), +8 health (12)

Level 9: Deals 80% more damage (1.35 damage), +16 health (20)

Level 10: Deals 100% more damage (1.5 damage), +28 health (32), zombies near the target take 0.5 splash damage

Black Belt
Level 1: Attacks 5% faster (0.238 seconds)

Level 2: Attacks 10% faster (0.225 seconds)

Level 3: Attacks 15% faster (0.213 seconds)

Level 4: Attacks 20% faster (0.2 seconds)

Level 5: Attacks 25% faster (0.188 seconds)

Level 6: Attacks 30% faster (0.175 seconds)

Level 7: Attacks 35% faster (0.163 seconds)

Level 8: Attacks 40% faster (0.15 seconds)

Level 9: Attacks 45% faster (0.138 seconds), attacks have a 5% chance to knock back an entire tile's worth of zombies and deal 3 damage

Level 10: Attacks 50% faster (0.125 seconds), attacks have an 8% chance to knock back an entire tile's worth of zombies and deal 4 damage