FITS used to make a shade called “dove gray” which is just barely gray that I have used for showing. I have a white horse, and I think that putting any white on him makes his color look not-so-white. I have worn these with a navy coat, or with a charcoal-gray coat with navy collar. It would look fine with black too, but if I’m going with something a bit different, I like to make it a whole outfit “look”.
I use a navy pad with sliver/gray trim. I don’t really like the gray breeches with a traditional white pad. (but again, I am riding a white horse who doesn’t look good in white to begin with) Black, or charcoal pad would also work, depending on the horse and what color coat you are using.
I also have a light gray satin stock that I wear with my gray breeches, but I don’t know where to find one anymore. The manufacturer of mine no longer makes them in that color. I really love my gray stock, but I don’t think it is necessary, the outfit looks fine with a white stock. I have worn either black or white or gray gloves with this outfit. I do think that silver accents (buttons, stock pin, etc) work better than gold with the gray.