A.J.
I'm a retired (for now) fashion designer. When you are actually the designer, you are not able to spend your time making the patterns or sewing the garments. YES, with the best degree behind you in the world, you will have had those core foundations, but many designers do not. For years in various companies, I only sketched and let the tech department do everything else. Yes, I had basic sewing knowledge and knew the garments COULD be made, they weren't totally esoteric or anything. Then, when I had my own business and was paying through he nose myself for pattern-makers etc, I went back to school and learned those skills.....only to find out, there is no time for that and you need to just let others do it.
So. If you just want to see how your ideas would look, I don't know of any sources for that-though there may be some and how cool! but I say, keep sketching and BELIEVE your vision is good. Put together look books and tear sheets of fashions you like, learn some sewing if you don't sew already (but again, not TOTALLY necessary if you have an instinct for garment construction), and who knows what direction you'll take. Why don't you order a school catalog from FIT and read all the course descriptions and see what speaks to you. Then see if there are any comparable classes or even design books that would help you. They may even have leads to the resource you seek (website for finished garments from sketches). There are so many elements to fashion design, you should find what your appropriate talent is. It's very rewarding!!!