it seems that there's a good majority of threadless wanting hoodies to be printed and I think it'd be a great idea. however, rather than typical heavyweight hoodies, I think zip-ups are very appropriate for the summer on those breezy afternoons, cool nights, or rainy days!
I know that st. john's bay makes a really good zip-up hoodie (plus they're cheap, I got one for christmas) but I don't think they have an official site. you can see them in their shop on jcpenney's website though. the color selection and variety of styles and sizes are perfect. you guys should really take this into consideration!
http://www.jcpenney.com/jcp/Products.aspx?DeptID=0&CatID=022792&Grptyp=SIZ&ItemId=07ac028
ALSO, I think you might be interested in this. here is a cheaper yet equally appealing source for girly tees.
http://www.bella.com/1x1babyrib/1001.php
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