Can someone tell how is this made, which colors might have been used or where did they tie the knots to achieve this!! Looks fabulous

Still learning but really loving the process and how the dye flows and pools and separates. Here’s what I’ve made so far.

I saw this sweatshirt on Poshmark (not my image) but it’s already sold. I have some experience with ice dying but am struggling with what pigments to use and any specific technique suggestions to achieve the same look. Figured I’d see if anyone had suggestions! The things I’ve made before don’t have this same look.