I wear 7.5 Hokas and probably am better off with 2 pairs of socks with them. Bought 7.0 Hokas once and were far too tight, had to send them back. Basically I think my ideal would b 7.25!! Am getting conflicting reports about them. Workmate bought 3 pairs and decided on 0.5 under his normal running shoe size(which is 1 size above normal trainers anyway).
So that is all clear as mud. My instinct is to buy 7.5 and where 2 pairs of socks if necessary.