Primal Instinks here! I recently uploaded a video where I measured my muscles as well as the length and circumference of various body parts, and that gave me an idea of sharing more size information about me -- this time in terms of clothing.
Here's the muscle-measuring video in case you missed it, and under that is a list of sizes for all the clothes I wear (in USA sizing), with my mattress size included as a bonus!
T-shirts: Medium, slim fit
Tank tops: Medium
Hoodies and sweatshirts: Large
Running shorts: Medium (32" waist) with 5" inseam
Basketball shorts: Medium (32" waist) with 7.5" or 9" inseam
Cargo shorts: 30-inch waist with 10" inseam
Jeans and long pants: 30" waist, 30" inseam, slim fit
Underwear and boxers: Medium (32" waist)
Socks: Large (9-12), quarter-length
Shoes: 12, low-top running shoes and high-top skate shoes
Mattress and bed sheets: Queen
How do you measure up compared to me? Do we wear the same size clothing or sleep on the same size bed?