Hi, I'm certified AdWords professional with several years of experience in internet marketing sphere.
I have vast experience with keyword building as well as automating campaigns, using AdWords rules and custom scripts.
I can build keyword list and create campaign in which every city would have it's own ad, which would be beneficiary not only for better segmentation of which shirts sell and which don't, but it should also help you get better Quality Score which directly affects your cost-per-click.
I can start working on this project ASAP, if there's anything else that would help steer you decision towards me, feel free to ask me, I'm more than willing to answer all questions!
Regards,
Ivan