that is a good idea, you should do that.
here's a picture of one:
here's a picture of my friend molly wearing one:
t-shirts are hand screen-printed by me, and they are amazing. you should buy one.
you can buy one for £13 (which is about $21.30) + shipping (which is £1.50 inside the UK, and £2.50 outside the UK). each one is hand-made to order, and so might take about a week for me to make.
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UPDATE:
you can't buy these any more, i'm in a place where it's impractical to make them. i may reopen at christmas but probably not.