I wear a 45 or 46 in the Euro size which is somewhere in the 11.5/12 US size. Whatever they are, they fit well. I error on sizing slightly smaller with motorcycle boots because I dislike dragging toe sliders
, it happens every now and then.
I can speak for RST's budget racesuit too, it's the one in my profile pic. I've done a trackday with it and it's been my main piece of riding gear for probably two years now. The leather is really nice and for $400 you get nice protection. Once my Cortech gloves wear out I will be trying RST's TracTech gloves. They're not the cheapest but I believe they have kangaroo leather palms which is definitely a higher end feature.