These are undershirts purchased from Uniqlo. They are easy to put on and take off with buttons, and I found them more useful than long underwear. The fabric is sturdy, so I think they can still be worn. If sold separately, they are 450 yen each. Nishimatsuya Birthday Babies "R" Us futafuta mamaraku tete a tete Cottoli Akachan Honpo Preparing for childbirth Newborn Smart Angel Shimamura Nursery school wear Park wear Girl's clothes Boy's clothes Baby clothes Baby clothes Overseas children's clothes Korean children's clothes petit main breeze Markeys