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please send in your bids ASAP.
actually, i do not design these on a website. rather, i make them in a program called photoshop cs2. also, you'll need to download the kit templates if you can get the program as they will help immensely with the shape of the shirt, and also templates from many brands.
and if you really want to, you can always purchase the real shirts for your team and put crests, sponsors, numbers, etc on it like you would on the program. however, you obviously won't have as great of control over the design.
hope this helps.