I have some 501's that are labelled 32" waist and are the same size as my others that are 34"

I wear them when I am feeling low, added bonus is the label on the outside for confirmation when I tell everyone I am a 32" waist, i tuck on those days

When not feeling insecure I just wear the 34's and untuck

On a similar note i am a 'S' in saltrock and I wear that jumper inside-out, on the one hand it displays the size but added bonus is it hides the embroidered label on the outside

So basically what I am trying to say is this, in future take your old clothes to a charity shop