Most reviews say to buy 2 sizes up, which I did.  I generally wear a 36 waist and ordered a 40.  The fit is loose and comfortable for yard work, bending, reaching, etc. Any smaller size would be too small.  The fabric is heavy and appears to be durable, but not cool for summer use.  The clasp for shoulder straps is a small copper clasp and difficult to fasten for me.  I would have preferred the old style button hook type.  However overall the quality is excellent and I expect to get many years of use from these.  I would definitely recommend them and would buy them again if this pair ever wears out.