I'm late to this, but Air Max makes velcro binders that you can adjust on the side - so if you get stuck somewhere for a long day, you can loosen the side exactly to your liking if you're uncomfortable. I wear mine loose and they also make me look REALLY flat because the material in the front is thicker and has a very... flat way of sitting.
FWIW, I wear a GC2b three sizes up from what I measure, and I'm not comfortable wearing that for more than 4ish hours. The look of the GC2B is great, though.