In Honey Select 2/Ai Shoujo, there's a certain condition when accessories will be disabled by default. Condition in particular is when the card is applied using accessories, it will dissappered in bedroom and bath mode, card outfit will also changed to the default one.
How to fix this?
You must make a copy of the card outfit set in the outfit section manually. Go to "Create " character section.
Load your character card, open your outfit section, and click "Costume Card" and "Save New".