For the HDT option you need the skin meshed physics mod. It adds physics simulations to various body parts but most notably breasts. If you're not using HDT-SMP then just build the regular option.
Thanks. I was trying to add some zaps, and I wanted to make sure i didn't have to do all the work again. None of it works anyway though since i didn't get my physics working for outfits since the september update.
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CBBE Creation Club Outfits BodySlide - Everything Else
I'm not a professional at this but they're better than nothing until syb888 decides to update. :)