Usually for those, most I've heard used were corset's with steel boning. It'll allow you to retain shape while giving you maximum stability.
RWBY: Blake Belladonna - Gambol Shroud FUNCTIONAL
RWBY: Pyrrha Nikos - Milo FUNCTIONAL
: On Hold
Planned Cosplay 2016
- Winged Armor Year: Tentative
Kazuma Adventurer Pantsu Thief [Kono Subarashii Sekai Ni Shukufuku]
Anime Expo: Fri-Gathering host!
Power Persona Q version [Shin Megami Tensei]
Anime Expo: Sat
Chaos Dirge of Cerberus [FF7]
Anime Expo: Sun
Tuxedo Mask [Sailor Moon]
Anime Expo: Mon