I recommend sizing up about 3” in the inseam, and maybe 1” in the waist (or even none).  My actual measurements are about 37x33, I usually wear a 36x34 jean (denim tends to be a bit vanity sized), and I wear a 36x36 STF comfortably.  The waist will stretch a lot - if it shrinks more than you expected, put it on damp and let it dry on you.  Just be careful not to stretch out the knees.