Honestly, while I love the look the cloth sims create, the Blender defaults are way whack and usually takes a lot of playing around with to try to find what works. When I did my mushroom girl last year, i spent hours just playing with various settings trying to get the dress to come out looking halfway decent. It’s a matter of finding the right balance of the various values for the weight of the cloth. Also, you want to make sure both collisions and self collisions (i mean the ones on the cloth properties) are turned on, though their distance values might need to be tweaked lower from defaults
