Hi everyone !
I have this idea since a while because i like to have many accessories for my knights, but it often happens that i would also like to put on different ones everytime without being forced to destroy those, and i also have another problem with some of those because they "clip" with the armor giving strange results (that sometimes are acceptables but some other times are not), so i may have two suggestions about the accessories:

1) Binding
Once an accessory is attached to an armor it is permanently bound to the knight, like for the weapons so you can attach/detach it as many times you want from your knight armors without destroying it but you wouldn't be able to trade it away anymore, so basically once you attach it, is yours and will be yours forever. If you don't want that item anymore at all, the only thing you can do is sell it to a vendor (like for example when i sell to the vendors the pieces of armor i get from tokens by beating the bosses over and over since token items are bound to the knight) that will give back an amount of money depending on the item rarity based on the kind (prismatic, volcanic, etc.) and kind of item (wings, shades, tails, etc.) so for example a volcanic or prismatic item is worth more than a toasty or regal one, and some wings will give back an higher amount of money than a canteen.

2) Position editing
Something that most of the knights could have noticed is that some accessoryes tend to clip with the armor pieces, so i was thinking about Bechamel having an "accessory placement editing" feature too, so for example if a wide vee is mostly hidden by your helm you can use this function to realign it and don't make it clip, or if you want the items to clip and give some particular effects you can edit them from the original position and move/rotate them around too.