Go crazy with D-rings, there is so much possible!
With D-things you can really make anything. Such as closures for a bra with a cord through it, or for a bodysuit as a nice closure at the front. But also practical applications such as for a bag, belts etc.
The sizes mentioned are the inside dimensions / transit dimensions.
Tip!
If it is going to be pulled, then it is useful to briefly reinforce the latex that you are going to get through the ring with a strip of twill band.