Here's a link to some digital costume collections you might like to have a rummage round! And some other online resources to get you creative juices flowing!
https://www.textilesociety.org.uk/textile-links/online-databases.php
https://www.fashionandtextilemuseums.com/digital-collections/
https://www.textilesociety.org.uk/textile-links/online-databases.php
https://www.fashionandtextilemuseums.com/digital-collections/