What size should i get if im 6'6" 325lbs?

I am 6’3” and 270 lbs. I got the XXXlarge (3X) because I wanted it to flow. I am very happy with my choice. You being 6’6”, you might want to go with the largest. Be aware, the fabric is thin. It was perfect for me because I had a doublet, jack-o-bite shirt, black jeans and boots under it, so a little less fabric weight was great for me. I live in central Ca, where it stays hot until Thanksgiving! Stay away from strong lights, it will show through. But, it photographs well.

What would you recommend for a person who is 5’ 7” and 190lb?

I'm going to say about a 2 x . My son is 6'3" 395lbs and a 4 x fits him perfect. Perfect length too

My husband's 270ish and 6'4". usially a size xxl, but what should i get for this?

We are about the same size, and I got the 3X. A good move, because it gives the robe good drape and flow. Be aware, the material is a bit thin, so avoid standing by bright lights. But, it drapes beautifully. For the price, it’s a good deal.