PhilC's fine content-creation products are brilliant additions to Poser, but they do not come with Poser... at least, not the current versions of Poser. Thus, his Clothing Designer Suite of tools is one of several external-to-Poser solutions for creating Poser.

I agree with Laurie: the name "Poser" says it all. It wasn't designed to be content-creation software. More recently, the lines have blurred, but you will all have to agree that the bulk of Poser content is still created in specialised software desgned to manipulate mesh on a completely different level to Poser.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks