Sharon Long and I were talking about this book yesterday, the image of four girls laughing is a favourite - great hair reference.

The Design Centre

Swatch cards for online research through The Design Centre at Philadelphia University

via TextileNerd

Cora Ginsberg Gallery

1880's printed summer muslin, a detail from a costume for sale at Cora Ginsberg. 

Catalogues from previous years which are available online as downloads contain some great reference material.

Victorian Photobooth

There are some great images in a Flickr group right now - The Smiling Victorian. It's great to see the human side of people who usually look so staid.

The Rag Fair in Houndsditch

Today's Spitalfields Life has a great posting about the Old Houndsditch Rag Fair with interesting costume details in the illustrations and this John Thomson photograph.
I keep meaning to find out more about the Bishopsgate Institute where these pictures are from, The Gentle Author's previous posts have whetted my appetite but I never seem to have any spare time to go there.

Tiny Teardrop Sequins, Late 1880's Hat Detail