I say go medium. My 686 Strap comes in tomorrow and I'll take a picture of it on.
If you want, I have a picture of my 140 pound brother (6') wearing the 686 plainter and his special blend pants, both in large. its ridiculous...
And if you have a burlington coat factory outlet near you, they had it for $89 at mine.
http://i28.photobucket.com/albums/c2...g?t=1212970010
He's way too skinny...but yeah. go with the med.