PA,
under Big Game Regs, bottom right page it states:

Blinds: Blinds can be used for big game (see turkey section for specifics
for blinds used while turkey hunting), however, the required amount of
fluorescent orange must be worn while in the blind. Although, not required,
it is recommended that some fluorescent orange be displayed outside the
blind.

www.pgc.state.pa.us/pgc/ lib/pgc/digestpdfs/2006/big_game.pdf