I don't have my reference (stuck at work overnight), but those belt fittings look appropriate for a mid range impression if that's what you're looking for. If you wanted to go wealthy you would be expected to have them silver or gold plated, and the rest of the belt should be highly decorated. Commons would probably have pewter fittings on a lot of their stuff because it's super cheap. I'm assuming those are for a soft-kit belt? Those types of fittings are seen on thin belts for wear in your normal civilian clothing.
Chuck R can correct me on this if I'm wrong. The nuances of who can wear brass is not my specialty, but I'm fairly confident it's cool for mid range and the lower portion of the upper class, but will give way to gold and silver at the knightly level.
Get yourself a copy of 'Dress Accessories' from the Museum of London series of books if you really want to get in to appropriate fittings, brooches etc...