UNDEROOS! I had Superman, which ones did you have? : r/nostalgia

Captain Underpants': How Underoos Got Its Origin Story

The ghost who walks… – Hitchy's World

Vintage 1980s Superman Underoo T-shirt Size M 6-8

Superman: Legacy' Brief Issue - James Gunn and Team Underestimate Underwear Incorporation on New Costume After 100s of Designs - The Illuminerdi

Underoos are still around and now they come in adult sizes

Underoos! : r/nostalgia

James Gunn's DC Studios Plans Are Very Exciting and Fix Nothing

Bed Sheets of the Early 80s : r/nostalgia

Superman Underoos! half-assed productions

Self-aware Superman comic : r/funny