I have put together some sites with clothing inspiration for children. Boden is showing lots of knits, bright colors, polka dots and layers. (I LOVE the women’s clothing here as well). Baby Legs are very cute with dresses and are great for “naked baby” images.
Janie & Jack and Strasburg offer a more classic look, they have adorable outfits for the holidays. See Gymboree for the more casual Christmas looks.
Hanna Anderson has some adorable sweater dresses for girls and if you want to coordinate the entire family for portraits, this is the place to go! Of course, I say you don’t have to all match, just coordinate with colors that work well together.
6pm.com has a great sale on boys shoes going on: Puma, Adidas, Kenneth Cole, etc.