Since I've spoken before about how hard finding "adaptive clothing" for children larger than toddler sizes I thought I'd post some of the places I've been successful.
Gymboree is great - they have lots of leggings that can be worn alone or under skirts/dresses that wear well and have elastic making them easy to pull up and down. They can be expensive, but they have awesome sales, you just have to be patient. Join their e-mail list to be notified of the sales.
Herbergers (also called Younkers, Carsons, Bon-Ton, Elder-Beerman) finding shirts. They have great sales and clearance, and lots of the shirts that flair out and tie in the back. These are great for when you are dealing with a child who is often constipated because they don't put pressure on the waist.
Merrell's. They have excellent support, and come in lots of different styles. Best of all, they have Velcro in larger sizes!
Merrell's, we did New Balance. We still love them (and wear them) but they just don't have as many "stylish" shoes that go well with dresses and such. We have also had some success with Croc's in the summer.
Another thing we use and like are zipper pulls. We attach them to items that have small zippers. They can be really helpful, but they do tend to break easily. We got ours at Toys R Us (they are not online that I can find) and they offer them with your child's name on them. I really liked that, as it helps keep track of their stuff as well. Just in case you can't find them, here is a link where you can purchase all different styles online. I have not ordered these and tested them, so I can't tell you the quality. :)
Similar to rice bags (or flaxseed, herb, etc) these bags can be placed in the microwave for heat, or in the freezer for cold. My daughter gets "hot" feet, sometimes they just feel really hot and uncomfortable, other times she says they burn. We've not quite figured out yet why this happens, but the hot and cold bags are the one thing that soothe her. We prefer to buy the felt covered ones as they are soft too. We've been through just about every kind of heating and cooling bag, and the corn ones are her favorite. One of these links is on how to make your own, and one is where you can order them. I haven't ordered here (we got ours at a show in a mall) but it looks like the same product.