Add me to the "WTF are they talking about?" folk.

Quote - You only need to Set Figure Parent before Conforming if you are trying to conform the clothing figure to a figure whose size you have altered from that which the clothing figure was originally designed to fit.

What's wrong with conforming to a resized figure, then going into the clothing and change size manually? That's what I do. I need to go into the clothing anyway to set morphs (crosstalk is the first thing I break when buying conforming stuff), so it's not a big deal.