So I just wanted to give you my experience regarding the shrinkage with 501 STF bought on Amazon.com and shipped by Amazon.
The label sized ordered was 33x32.
When I received it, it measured 34" waist and 32" inseam exactly.
I did a very hot water soak, inside out, for an hour and directly soaking wet into hot dryer for 40 minutes until very slightly damp.
Out of the dryer, it measured 32" waist, and 29" inseam.
I put it on and after 2 hours or so, the measurements are now 33" waist and 29.5" inseam.
It's now been a few hours and it seems to be holding this measurement.
Side note, the care label has no information on it, simply it has Levi's in red and a white cloth that is blank. These are made in Mexico. The cardstock says 2008. The button says 4032.
Hope this helps.