As mentioned this is related to Marvelous Designer - I've created a large sheet to fall on my Mixamo model and I've followed at least 3 youtube tutorials to create a ghost. Straight out of the box it seems to work for other creators but mine just seems to be intersecting and looks to be quite low poly. I've changed the particle distance as well as looked at the model scale and everything looks fine on that perspective.
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I don't play with M.D. much (i should) but when i did things, i thought of them as get the results 1st then worry about what it will look like at the end.
So go as high as you think you should with this, maybe 50k triangles (as an example) then use other methods to lower it to your liking.
Also maybe linking the video that shows you the smooth transition you are following and ending up with a different result. Also ask that youtube creator so you get "results" from the horses mouth, so to speak. Sure someone who knows more will come around eventually.