Stop worrying about whether it says "slim fit" on the tag, and focus on how the suit actually fits you. You need to try a few suits on to figure out what looks good on you. Slim-fit doesn't tell you much about how an item will fit you. Companies just know that it's what customers like to hear. It's like putting "natural" on a food product. Unless you get specifics, it means nothing, but it sounds good. Most people are just too simple to realize that.