IKO ICHIGEKI Dogi Sizing?

My Shihan is going to Japan soon to visit for a Championship competition in Tokyo and is opening orders for the IKO ICHIGEKI gi’s. I’m torn between getting a size 6 or size 7 for the 210 (thin variant) I heard it’s mostly about height, I’m 6’1/187 cm if that helps at all. I’ve also heard it shrinks a bit in the wash.