The checkbox means that if a clothing figure has morphs available that correspond to the "human" figure, you want the values set the same as you have the human figure set. Yet, I would think that should be on by default too.

Different clothes behave differently because different vendors use varying approaches. The same clothing can behave inconsistently depending on what's going on at a given time in your workflow (and probably, bugs).

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3