I love your digression into the realm of Staropolska--and the pas kontuszowy, and I'm assuming that these might still be worn by some Hasids during Shabbat.

And, of course, it brings me back to Pan Tadeusz and the section at the end of Book 1:

When he [Judge Soplica] finally wished to join the sleepers,

he called upon Protazy to unhook

his belt from Sluck, which was finely embossed

with crimson flowers and rows of gold brocade

on its front--rows of rich black silk criss-crossed

with silver thread sewn on the other side.

The gold side could be worn on holiday,

the black on solemn occasion, to mourn,

Only Protazy knew the proper way

to unclasp it and fold, after it was worn.