...or: "I don't speak Portuguese", but if you do, you may get even more joy out of this Portuguese museum search engine: Matriznet
The search engine is available in English but the information on the objects is in Portuguese. But I always liked picture-books better anyway!
Click on collections to start a new search.
In the "Classification" box, choose "Traje".
Scroll down to "Century" and pick = in the first box and type XVIII in the second (if you want to search for 18th century items, of course!) and hit "Search" at the bottom of the page.
Mostly men's clothing, which is particularly of interest to me nowadays, since I've set my mind on making a suit for my husband - oh my!
Also beautiful fans and lovely buttons with painted miniatures among other things.