The Gildan Activewear Sizing Chart on this item only includes measurements for chest size, no information about pants.  These pants appeared to be almost an exact replica of the favorites I currently have, so I ordered the same size. And yep, they are designed just like the ones I love.  Oops... guess these run small.

Too bad I won't be ordering a second pair.  This pair has a 5 inch gap down one side where the seamstress failed to sew it together.  I wonder how the rest of the construction will hold up under wash and wear.