I think you are the coolest. One of my favorite books at the moment is "Stop dressing your six year old like a skank". Basically, its goes to what you are pointing out...children no longer dress like children but 30 year old Vegas showgirls. Way to go and make a point. LOVE IT!!!!
Hair wise I think a high ponytail with a plastic bone would work sort of a cross between Pebbles and Wilma. Hers was more of a high bun if I remember right with a band around it. Check the Cartoon Network I'm sure they have stills from the show.
We have the Mecca of fabric stores near us....Mary Jo's in Gastonia on Cox Road. They have everything imaginable, I mean EVERYTHING. You can reupholster a couch, make a wedding/prom dress, and buy every kind of fabric ever made in all colors, prints even fake fur if you desire. Another idea is to check out some of the local sewing machine stores they sometimes have sewing classes and check Michaels they have classes for projects all the time.
I have made patterns using old paper grocery bags, and depending on how large the piece needed to be this worked pretty well. Another thought is to get table paper from a medical supply store, its not as thick as the paper bag and makes a fairly decent pattern.