I'm shopping for my SIL who is 7 mo. pregnant and needs some long-sleeved maternity shirts that will fit her arms. She is about 5'10" and probably would wear a medium or large. I'm 5'7" so I don't have any problems finding sleeves long enough, and I'm not positive where to look. I thought Gap would probably have some "tall" shirts, but I only found maternity pants that were specifically marked tall.

Can any long-armed ladies point me to a reliable source for shirts that have long enough sleeves? Thanks!