More often than not, I find that when simulation fails on me it's because it can't calculate how a part of it would bend. For example, like the cloth is set to not stretch at all but at some point a non-stretch fabric would not allow a body part to bend that way without ripping.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.