Alright, I don't know if this technically counts as handmade, but it is from a smaller company, and it is made in the USA, and it does support fellow moms-with-ideas, so I'm prepared to count it.
In the interest of prodding my daughter away from fairies and princesses (and toward clothing that might protect her from frostbite in the coming months), I purchased the following from
Little Capers:

That's a long-sleeve t-shirt with generic super hero logo on the front, and a detachable cape on the back. Hurray for non-licensed superheroes! Hurray for capes! Hurray for washable costumes that can be worn in public and will fit in the carseat!
This is not a cheap gift, but if it's something that she can wear every day which will forestall at least part of the "you have to take that off to eat/sleep/go outside" arguing, it will be worth every penny. Assuming that she will wear it at all, mind you. She'll probably use it to top off that god-awful poofy ballet skirt I'm making, which will serve me right, I guess, but maybe, just maybe, I can get her to wear a pair of jeans. Once.
Little Capers come in various generic superhero styles (you've got to check them out - the Saturn one is soooooo cool!), in sizes from 6 months up to 6 years. Available at local boutiques in many states, the shirts are also available for purchase direct from the company at www.littlecapers.com .