I am 5' 8 145lbs. Yeah I' m a runt, but that just makes me harder to see in my ASAT.
BigNastyD
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But you should be able to get away with a medium.
I am 5" 8 about 170lbs and I have a large that is a little too big on me
but I like loose fitting clothes.
All the 3d suits are cut slightly larger to accomodate layering.