On their facebook page they posted,
"Kauai Kimonos I am5'11 and used to weigh 185ish and wore the A2. I like my gis quite fitted, so if you don't, get the larger size.
Kauai Kimonos ‎(now 165 & A1 fits like a glove, very fitted!)".
I also like my gis fitted, I'm 165 & 5'7 so I got an A1, it definitely doesn't fit me like a glove and the sleeves are too short.
I have other gis that are a bit heavier and are very tight to my body and I don't feel inhibited in the least, I think their design is flawed.