Ring Bearer Outfit

Hello all! I am in need of some help when it comes to ring bearer outfits. To get an understanding our wedding colors are peacock colors.

The groom is wearing mid/dark grey slacks, a long sleeve white shirt, same grey colored vest, and a navy long tie (to correspond with my navy shoes, jewelry, etc).

Groomsmen are wearing same pants and white shirt, cognac brown suspenders and shoes, and a bow tie (two blue, one green, one purple).

Now the following questions arise for what the ring bearers should wear...

1. Should they wear a similar grey to the rest of the guys or a light grey to stand out a little bit?
2. Should they wear suspenders and/or a bow tie?
3. If yes, what color should the suspenders or bow tie be? (Navy to match bride and groom, brown to match groomsmen)
4. Keep in mind these kids have a pretty wide age gap (one will be just shy of 2 and one will have just turned 6) so we have to get something that will be easy to find for both kids.

Thanks in advance!

Allie