Shoe size question

[RQC2700]

I have just procured 2 pairs of the same Gucci driver. The 11.5, fits perfectly now, whereas the 11 fits just a bit more snug while not being uncomfortable in the least. I want to always wear these without socks, so my concern is how much will they stretch? I am worried the 11.5's will stretch out to the point where they are too loose to be worn barefoot.

I know this might be an odd question, but any input would be appreciated.