My suggestion would be this: make the lace bit a separate material. You can do this in Blender quite easily: in the material panel, assign the bit that is going to be lace to another matrial zone to the main dress texture. You're going to want to use a transparency map to tell Poser where you want the lace to show and where not. I'm on my way to Cairns so I'll be away from my computer - and Poser - this weekend, but if you want to wait that long I'd be happy to do something rough for you so you get the idea. Mind you: Stitch Witch will do transparencies and lace quite nicely...

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