Hi,
Looking at the moreclothing settings, it appears that Body contain in fact a lot of things which can be totally different than "Body". For example,
Female Helper.swf=Female Help:CostumeHeadwear>Body:CostumeBottoms>Body
Tentacle_Monster.swf=Tentacle Monster:CostumeCollar>Body:Body+reghue
So, to get rid of the Tentacle Monster, I assume that it is the Collar that you need to remove.
Have you tried something like [SETVARBYNAEM_da.clothes.collar_undress] ?
With a "undress" variable set to "none,0,0,0,1"
The Body and Body2 are not real clothes categories, they're just a way to organize mods which utilize many categories (Or that's what I understood at least)