This past week, I ordered this great book,
Victorian Fashions and Costumes from Harper's Bazar, 1867-1898 (Dover Fashion and Costumes), which features 1000 illustrations, including dresses, accessories, and children's fashion. Right now, this book is priced at $3.99, which is over 80% off. While it isn't directly connected to either children or steampunk, it is a great source of inspiration for both. I highly recommend the book.