Momocat - pretty classic designs for Blythe and tiny Betsy McCall. She has some tutorial entries too, but your have to dig for them.
ヤマケイ★Blythe★お気にめすまま。 - soft romantic clothes with lots of lace and pretty details.
Vanilla Latte - beautiful romantic styling. Great blog list and links to check out. She does a lot with petites and other dolls too.
Daisy D - incredibly romantic Gothic Lolita style clothes for Blythe and Kuma, etc.
Cherry Merry Muffin - darling Mary Jane type dresses. Classic and fun.
OK, so they're all Japanese, but what wonderful clothes they're making. I'm drooling with my jaw on the floor when I look at all their stuff. Take a look for yourself and see if you agree with me. I went back through all the entries on these blogs and it was worth it. I admit that it's a bit frustrating not to understand Japanese, but the pictures are so beautiful it doesn't really matter. Sigh....
PS - these photos were borrowed without permission. All link back to their blogs. I just had to show you how wonderful they are, so please forgive me for pilfering.