Inspiring Dresses is very similar in concept to the first two- a blog of gorgeous period dresses. It focuses on 18th, 19th and 20th century fashion, primarily for women, but also for men and children. I love how most dresses have shots from different angles and some close ups- just the sort of thing costumers need. The blogger also takes requests, which is good when you need some ideas for a particular upcoming LARP. (I think OMG that dress! and Fripperies and Fobs do, too.)
A favorite of mine:
Found this blog through the twitter account of a friend and fellow LARPer, sometimes called The Costume Fairy.