I picked up Kwik Sew 3389 from my local Fabric Place. I made a muslin version over the last couple of nights.
so far, this is unmodified from the original pattern, with the exception of the short sleeves over the long ones. for that, i just used both sleeves from the pattern, and put the short ones on top.
you can sort of see in the pics that we were marking out pocket locations with a sharpie.
next up i'll be putting the pockets on there. i'm not bothering with a collar on the suit, since the neckseal would cover it anyway.