Be careful, that can be a pretty dangerous place if you're lower level.
As for the clothes, they seem to be random in containers (I've started a few new games recently and the clothes in the Sanctuary suitcases/dressers are always different). Most of the crashed busses, subway trains, and planes you see around have skeletons with suitcases which are a good source for clothes - but they are still random. As for some place that's hard-coded, I'm sure there is a locker room somewhere that is guaranteed to have this outfit folded on its shelves, but I can't remember any specifically.