Start with the WVU Libraries catalog WorldCat.
To focus on clothing and fashion search: Other suggested search terms:
“clothing and dress” and [country or time period] portraits and [country or time period]
Notice that on the left you can limit to Print Books (37) or eBooks (14). Clicking on the title of a print book will give you the library location and call number. Clicking on the title of an ebook will give you access to the full content.
Are you looking for more general information? Try:
"social conditions" and [place] and [time period]