Collars?

[Scrapdragon]

I've noticed in most of your pics there are no collars on your maine coons...

DH insists the cats have collars. We had got a collar for Charlie Brown the day after we got him.

I wasn't thinking about getting a collar for Gryfn, as I'm thinking he will get too big for a normal collar, and then also I don't want his ruff "marred" by the look of a collar (yeh I know... purely asthetic... )
And also he won't be going outside.
DH is just worried that if they get outside accidentally they at least have a collar on them....

Do your cats actually have collars and if not, why?