re: #99 SanFranciscoZionist
Never worn stays, but Elizbethan and fourteenth-century underpinnings give me more back support than a bra.
Stays give excellent back support, and they really do help when lifting buckets and firewood around camp (yes, we camp out during re-enactments. I dress out as a male soldier, since shooting and fighting in the battles is more fun IMO)