Nice Suit Runs Small

It seems like a decent suit, nice, light weight and stretchy. Definitely runs very small, even for a wetsuit. I usually take a women's tall small in t-shirts and a 4-6 in pants/shorts. I am 5' 11", about 135, 38/29/39 with fairly broad, square shoulders. The size 10 wetsuit was loose in the arms but uncomfortably tight in the shoulders, with a loose waist. The 8 was snug everywhere it needed to be but so tight across my shoulders I could barely move them. The size 6 I couldn't even get on- my 5' 7", 100lb daughter fit into that size better. I ended up keeping an Xcel Leahi size 8, also from Sierra, that fit my body type much better.