Guilder
03-08-2019

Equipment with this effect:

Nigredo Boots (R10)
Chef's Coat (R9)
Karna's Earrings (R9) Carna's ear ring / カルナの耳環
Sun Wukong's Headband (R9) "Goldfish" / きんこじ
Starfish Hair Ornament (R9) "Starfish hair accessories" / スターフィッシュの髪飾り
※ (R9) "Alchemist's Jacket (Wed)" / 錬金術士のジャケット(水)
※ (R9) "Alchemist's costume (water)" / 錬金術士の衣装(水)
Chef's Coat (R9)
Lord Helm (R9)
"Blue Mesh Muc" / ブルーメシュムック (head) (水)(R9) -- special event
"Sternen Tufu" / シュテルントゥーフ (head)(R9) -- special event
"Ritter Hunt" / リッターハント (hand) (R9) -- special event
Laurel Crown of Prayers (R8)
Spanish Sailor Uniform EX (R6)
Portuguese Sailor Uniform EX (R6)
Venetian Sailor Uniform EX (R6)
French Sailor Uniform EX (R6)
Dutch Sailor Uniform EX (R6)
English Sailor Uniform EX (R6)
Turkish Sailor Uniform EX (R6)

Note: unofficial google translations shown in quote marks with original JP name for those who wish to research them. Also, some items may or may not be currently/ever available on Maris server.

By the way, about the black chef item showing up several times in that list? No idea why it's doing that; I found the correct equip entries in UWO DB's Japan side, entered the numbers, but it's like it's automatically redirecting to the chef outfit. Maybe that'll be fixed when the content pages are updated again on the DB. Hope this helps; cheers.

Source: gvo.gamedb.info/wiki/?Skill/Product/Alchemy/ItemBoost

Guilder
02-27-2020

Minor update:

Stuffed Sleeping Cat (R10)

As for the unlinked items in the list above:

※ (R9)
※ (R9)
※ (R9)

These are crossover event items and will likely not appear on Maris. I hope to be proven wrong of course.

CA-RvZ
01-03-2023

Sun Staff (R10)

CA-RvZ
02-03-2023

Hornpipe of Origin (R5)

CA-RvZ
01-11-2024

Harp of the Saint King (R3)

benjy20
04-20-2024

There is a mistake, Royal Easter Egg provides EX is Reduce Disaster Damage