"This includes clothing removed from the Starliner in favor of ISS spare parts"
So up at the ISS, it's the tried and tested, day 1, right way round, day 2 back to front, day 3 inside out, back to front, inside out.
Of course, if the underpants are briefs, they can then rotate them through 180 degrees, and use the left side as a gusset for another four days (as above) and then another 180 degrees to use the right side. Twelve days from one pair, so NASA need not rush on the laundry delivery.
As for tee shirts, astronauts can just do what male planet dwellers do, which is wear them normally until the armpits corrode.
Posts like this are what AC mode was invented for.