Diaper too tight?

Hey, this is a pretty simple thing that many people might have figured out, but if you have a problem getting your baby's diaper on perfectly, whether it's too tight, or too loose when you cinch up the velcro, I have a fool proof idea. Before this, I could never get my kid's diaper to fit just right, and they looked uncomfortable, or just like it was falling off. So, all you do is tuck your kids shirt/onsie into the diaper as you put it on, so the diaper is over it, then cinch it up the diaper nice and snug, and then just pull out the shirt/onsie, and the room left over from the clothes being tucked in gives it the perfect extra bit of room, so it's not too tight and not too loose! Understand?