I'd definitely wear human-sized versions of some of the old Barbie clothes I have from my mom. There's this one-shoulder pink overall jumpsuit thing with flowers all over it, VERY late-'60s hippie, that I would love in my own size. A yellow, yellow-orange, and orange chiffon nighty with matching bathrobe that I wouldn't mind wearing around my apartment. An orange velvet minidress with a drop waist and lace sleeves and ruffle.
There's also this makeshift off-white circle skirt that my mom made out of one of her old silk hair scrunchies. It's not actual Barbie clothes, but it fits around a doll's waist and it's very light and flowy. It also somehow still has its elastic-ness after 50 years? WITCHCRAFT lmao.