How can I do this?

Hey there! I saw this online and I hope someone to help me find the answer. It’s not with the giant knit for blankets, but I’m not sure how it’s made.
Thank you.

Welcome to KH!
Wow, that’s a stunner. It looks like maybe a couple of strands of super bulky roving worked together in stockinette stitch (knit one row, purl one row).

You’ll probably have to make up this pattern as you go, experiment and see what it’ll take.

here is also beautiful knitting dresses