Black Leather Chelsea Boots

Got these for Christmas 2016, they're a size 11 and I'm a size 10.5, in some shoes 11, so I thought they were fine, didn't wear them for about a month after, and realized they were kind of big on me, and I think they expanded a little, because now they're more lose on my foot. Wore them about 5 times, last time about a hear ago.