I think I might have figured out how to go Trance in the middle of the chess board as Garnet. A few ways:
As Amano: wear Trance under it and stripe as one of my attacks, attaching the sleeves on afterwards.
Regular: wear Trance under it and have someone cover me while I switch wigs.
OR
pretend to get mad, storm off, only to come back on in full trance (wearing the trance under and switching wigs outside then bursting in)
Dress: no idea xD
Cloak: wear trance under it, with regular on top, then the cloak, and the blonde wig with the brown resting on top of it, but not completely on. Maybe the blonde pinned back a bit under it. Then I stripe the cloak and brown wig and stripe off regular so I'm in trance. All in dramatic fashion, of course. xD