Finding fitting pants, especially jeans, is the greatest problem for me. According to my waist size, it would be 32, but I usually get stuck half way in. Luckily, after a while, I found a brand that fits.
Same thing with regard to suits. I especially hate the constricted feeling around the shoulder girdle, not to mention the tent like feeling when I opt for larger sizes... wouldn't want it any other way, though.
The sad thing is, I don't even consider myself particularly big by any means.