I feel like this is quite a long winded and complicated issue but I really appreciate any help I can get!
(I have included the blender file at the bottom for reference.)
I am making a cloth object which has lots of different sections and textures. To keep the geometry as simple as possible I am attempting to paint on the textures using multiple image masks on the same material and UV mask in order to keep the geometry intact. Here's where I am at so far to give you an idea of what I am going for, I have made decent progress but it's getting quite complex:
I'm fairly new to the node editor and blender in general so this is already getting over my head. The main difficulty I am having at the moment however is firstly where to connect my displacement outputs in my bump maps. I connected the first one to the displacement input on the material output node which had an effect (although I feel it might have had an effect over the whole object instead of just the painted map)
but now that slot is occupied I don't know where to connect my other ones:
The second problem is fairly related. I want to have some of the patterns that are "printed" on top of my cloth to be slightly raised. I am guessing this is probably done by applying a bump node to the mask but I'm not really sure how to achieve it. Here for example is the image texture node containing the black and white mask I used for one of the yellow patterned sections at the top of the cloth:
I would like to have this raised very slightly to make it a bit more dynamic but can't figure it out.
Thanks for bearing through that explanation, I hope I have explained it with enough clarity and again I appreciate any help that can be offered!
Here is the blender file: 
