Here are some interesting websites you may want to take a look at 

• British Library
• Center for Pattern Design
• The Costume Society
• Costume Society of America
• The Costume Institute (New York)
• Costume Colloquium 
• Fashion Museum Bath
• Fashion and Textile Museum
• The Textile Society
• V and A Museum
• Worn Through

Some talented creatives I know and have worked with:

• Assunta Del Buono
• Teresa Green
• Rozalind Williams