Depends a lot on your size, Maddie. I'm lucky. I'm off the rack, standard size. I can buy suits off the rack, jeans without trying them on, and shirts without taking them out of the package. Not everyone can, though, especially smaller or larger guys with pants. I have a 30 inch leg, and that's really the shortest size you can find in the Levis bin without going to specialty stuff. My sleeve length is about the shortest as well - can wear 15.5/32 shirts. Even at that, the shirts are hard to find. I often have to push it to a 34 inch sleeve.
Larger guys, especially pre-T, will have fat distribution issues that will make it hard to find a pair of jeans that fit.
Dennis