Hi there

I would say this depends on more factors,but I would prefer to have several pieces and all conforming,because sometimes you don't need all of them

And again if you are not planning to add there any dynamic morphs like top down,skirt wind or panty down etc then i would say one piece should be OK too,but really as above I would go down the by B.Several pieces,but all conforming 

Hope this help

Thanks,Jura