The Rib Thong Proud B by Barcode is, again, available in all sizes in black and white : r/menandunderwear

Hansber Men's Sexy Pouch C-Strap O-Ring Support Bikini Briefs Jockstrap T-Back G-String Thongs Underwear Black One Size at Men's Clothing store

Barcode Men's Thongs & g-strings

5-pack ribbed thong briefs - Black/White - Ladies

Charcoal Rib Curve Thong Brief – Zulu & Zephyr

Barcode Berlin - Concept Brand for Men´s Clothes - Authentic Berlin

Barcode Men's Thongs & g-strings

Plus Black Seamless Rib Thong

N2N Bodywear Men black white stripe Hypno thong underwear size S M

Superchill Modal Rib Thong Underwear

B.V.D. Underwear [1924] : r/vintageads

Interview with Craig Hendry – founder of Bum-Chums underwear

Rick Majors Two-Tone Rib Thong Black TG100TTR-001 at International Jock

Thong