i went true to size on the grim tims as well. love the fit. the waist will eventually stretch to where a belt is needed but i don't wear jeans without a belt so thats fine.
one of my favorite jeans in terms of fit. puts the weird guys to shame.
lookin for a pair of iron hearts to cop now..
but the grim tims arent suposed to fit like weird guys.... they also arent vanity sized and don't stretch as much, so your comparing apples and oranges