This is something that has been inconsistently happening in 1.3 and 1.4. I'll set items in tags, apply tags to the paws, but they don't always equip things even if I know that there are matching items available.
In my current save, there are Excellent, non-tainted, 100% devilstrand button-up shirts and pants available, with the tag set to generic button-up shirt and generic pants, any durability and any quality.
If I force a pawn to wear them, then click "Clear forced" the pawn will strip down
The only thing I can think is maybe it's because these items had their quality improved with the Enchant Quality psycast from Vanilla Psycasts, but as I mentioned, even with the tag set to any quality, the pawns still won't wear them.