We finally got the Arlen Ness Wet Weather suits in. I tried on an XL with an Arlen Ness suit (size 54).
The rain gear is pretty tight, but seems to expand pretty easily. There's quite a bit of Spandex, and even the clear poly is stretchable.
All-in-all, I think it's a nice product but it runs a little small.
I hope this helps!
Patrick