When you buy store items such as any variation of glasses, many skins don't work with the placement of the hats. They can often be too low or too high, and it's disappointing knowing such a cool hat to wear is unusable with your skin. I think it would be nice to have adjustable hats so you can fix how high/low your glasses are so that they fit your skin. If custom adjusting isn't possible, there is also the option of having a few fixed but extra options for height, like how there's a 2x1 and 2x2 option for blinking eyes.