I'm not quite 6' but I am 5'9" and I usually rely on gap maternity. I wear a 6/8 pant in regular but they make talls. Their shirts are nice and long too.
5'9 here and I never had an issue with shirts my first pregnancy. I just had to try on a few to get the right fit. Luckily the weather will be about the same for this one so I'll wear them again. I got most of my clothes at motherhood maternity and pea in a pod.
Re: Tall girls...