I believe these are sears because they look identical to the underwear in the catalogue.
1970's Vintage Underwear - Men's Small Size Sears Blue Nylon Brief
NEW 70s Girls Slip Kids Underpants 122 128 Vintage Oldschool Underwear Pants
Kwik Sew 729. Boy's Briefs Pattern. Boys Underpants Pattern. Boy's Classic Briefs Pattern. SZ 8, 10, 12. Uncut
70s BOY(BOY LONDON)VINTAGE Bondage Pants Grey Pinstripe ボーイ ボンテージ(ボンデージ・ボンデッジ) パンツ ピンストライプ /【Buyee】 Buyee - Japanese Proxy Service
70s Briefs
70s Men's & Boy's Y Front Briefs, Underpants, Walk, Swim or Board Shor – Patterns Central
Buy 70s Boy Briefs Online In India - India
70s Boy Briefs - Denmark
70s Boy Briefs
Kwik Sew 727 Briefs with double fabric fly and crotch, have fabric binding at leg openings and elastic at waist. View B has bands from contrasting
Kwik Sew 727 1970s Mens Designer Briefs Pattern Tighty Whities Adult Teen Jockey Shorts UNCUT Waist 38 40 42 44
How Men Wore Shorts In The 1970s
vintage ricky's boys briefs cotton underwear size 12 (65-75lbs) NOS ~70s youth