Why does the cast of roseanne wear the chicken shirt?
I had heard that this was an older shirt that Roseanne wore,
just because it was something she had that was comfortable but her
then husband Tom Arnold HATED it, so she decided to wear it all the
time and as you say, there is even one episode when the whole cast
wears it, plus it is on her apron when she works at the Lunchbox.
Evidently all done just to tick Tom Arnold off!