this would take some work to achieve and no one is asking for it so its perfect thats usually the types of ideas bungie likes to implement
class items that can be mixed together
what i mean is for hunters your hood/neck/cape are all interchangeable with other cloak parts allowing you to mix them and basically make your own
for titans its the belt/robe/attachments and for warlocks it would be arm/band/insignia
again this isn't a must or a need i just thought it would be a cool idea