help choosing yarn for a project im designing

Hi! first time posting here so sorry if I mess up

im designing a sweater with a light flowy/oversized look. my first though was mohair, but I don't want it to be transparent so mohair held with something else, but I don't know what that something else would be. im adding a picture below to show the look im going for, but im not great at reddit so hopefully it shows

any help or recommendations would be greatly appreciated!!!

https://preview.redd.it/09m4ahgebpyf1.png?width=735&format=png&auto=webp&s=733876936a2b02f0af8d511f6802f39ff884c3b3