I believe these are sears because they look identical to the underwear in the catalogue.
Sears Underwear & Socks for Men - Poshmark
Sears, Intimates & Sleepwear, Vintage 7s Sears Sheer Granny Panties Size Xl
Трусы мужские Sears - огромный выбор по лучшим ценам
PHOTOS: 25 vintage male underwear ads & a brief history on undies - Queerty
COVINGTON SEARS RED Black Bikini Brief Underwear Men's Size Xlarge 38-40 $6.30 - PicClick
Vintage Broderick Active Comfort Knit Classic Brief Underwear Blue Mens Size 34 - Underwear & Socks
COVINGTON SEARS RED Black Bikini Brief Underwear Men's Size Xlarge 38-40 $6.30 - PicClick
It is 16 relaxed to 20 (its label size 40) and will at the waist fit a 38 to 40 perfectly and even a 36 should you need more room front and
40 SEARS VINTAGE MENS 2 RED STRIPED BAND USA MADE POLY BLEND BRIEF XL fits 38
1950s Lingerie History - Bras, Girdles, Slips, Panties, Garters
Vintage 70s Sears Silky Nylon High-waisted Granny Panty Underwear Brief Panties Lingerie Retro Wedding USA Read Description Glam Garb - Ireland