I'm not sure I like your clothing analogy, it implies that Haskell deliverables are somehow restricted in functionality, which isn't true. The "style" that Haskell prohibits is hiding side-effects and mutable state behind something that pretends to be a function. If you are honest and upfront about what you are doing, i.e. you fully understand what you are doing, then Haskell has no problem letting you do it.