They will stretch a little over time until they are worn in. I'm a uk 11 and wear uk 11 loakes to troop in. I used to wear regular sports socks but found after a full days troop my feet swelled from the heat and I found it very hard to take my boots off so now use thin style socks and have no trouble.
I would buy whatever size would be the us/uk equivilant - a size down?
its a shame you have cut the cod and ab plate but its not the end of the world.. i would strap this suit up so that the body parts are connected together and ditch the braces it will improve the look a lot. Also if you can i would move the elastic straps on the biceps 1 - 1.5 inches higher.