I've had a few requests for the pattern, I'm sorry its taken so long to respond but I never wrote it down. So I took a look last night and you can just make the Spring Dress Pattern with these changes:
Use worsted weight yarn and a "H" hook.
Do not work the increases after the armhole shaping just keep crocheting around until you hit the length that you want the shirt. And work 2 rows of DC around the armholes to make the sleeves. I hope this helps, let me know if you need more info.