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Are you looking for actual clothing items, or the racks/shelves they go on? If it's the former, then you're probably not going to have much luck. If it's the latter, you could look at seek.autodesk.com or do a general web search for Revit families.
Alternatively, if you can find what you want as a 3DS Max file (much more likely, as Max has a wider user-base than just architects/engineers/contractors), you can import that into a family and load it into your project.