go to
www.brandsoftheworld.com and at the bottom of the page, there is a search area - type in Hooters and you'll get the logo! just click on the picture of the logo and that will download an EPS file of the logo (this is the best quality you can get). What about printing the logo (using a home printer) onto the iron on transfer paper that you can buy - then transfering it onto a white tanktop?
If you don't have Adobe Illustrator, you can still open this file in Photoshop - if you don't have THAT, then PM me and I can create a PDF of the logo and send it to ya!
Good luck! Super cute idea! I might do this myself as I want to get a shirt that says "Momma's Boy" on it for Oscar!