I've not seen them appear in the hub shop, but I've actually seen the underwear blueprints spawn in World's End, so the base Pantsu mod does still work, it's just horrible rnd. The makeshift armor and dress blueprints spawn fairly commonly, though. Still it's much easier to just use the pantsu parade start and dismiss some of the multitude of ladies.

So, in order to get the designs, you have to buy specific blueprints that I detailed in the English Patch discussion. I've added them to a custom character in this start, so you can see them.

hey mod author, you asked me to see if your mod works in the comments on the english translation
yes the shop appears in the hub, but it doesnt sell any blueprints

Glad I could help!

you saved my life!