What are the martingales with the clips that attached to a D ring in the girth called

It might help if you posted an image but either an eventer's breastplate, a hunting breast plate or a 5 point harness.
 
Just thread a dog clip through your current martingale! If it's not quite designed for that - strap too long - get your local saddler to shorten it and add the dog clip.
 
plas equestrian will make you a leather one (endurance riders use clips not buckles, & plas also do leather work), or synthetic look at zilco, pioneer harness or performance equestrian
 
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