Yes, certainly there is some RTW for the slender, but it has a tendency to be cut "generously," to say the least. I doin't understand why anyone would want to wear a sack suit ever, much less someone who's built athletically or has a thin build. Obviously one could argue that the "fuller" cut will make you look "bulkier," but in actuality it'll make you look like one or a combination of the following: 1. child playing dress-up 2. obnoxious little nerd 3. man with no sense of proportion 4. man with something to hide If none of that's true, then why bother? The idea of shopping in the children's section is wholly ridiculous for the most part when it comes to something with so many measurements which need to be "on," as is the case with a suit. I have plenty of T-shirts that were originally intended for children, but a T-shirt is a T-shirt in most instances.