Basically it is very difficult to get pure white......... and nothing is ever really pure white as the environment will add colours to it. Also shadows will make it go grey. If you get it to go white chances are your lighting will be blown out.........I would just tweak the lighting until you get something you are happy with.
As for the stripes, get them right for the view you are using. You might need to up the anti-aliasing when you get further away from the model. At a distance you may be able to get away without using the bump at all and just using a diffuse map to give you a change in shade. You can always change the texture depending on how much detail you need.
I am not sure what you mean by halving the mesh. Do you mean UVing half and then mirroring it so you have both sides sharing the same UV's?? Or just speeding it up by UVing half the flipping them and patching them back together? You will need to UV both sides separately if you are going to use a displacement map for the cloth folds assuming that it will not be symmetrical.
The hand is looking good. I might just shorten the pad at the top of the palm:
The collar can be a separate mesh if it is working for you. Basically, what ever works is right.
Hope this helps.
Dan
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