I don't know if anyone else has noticed, but it applies to clothing as well.
I've worn 8 1/2 size shoes most of my life. Last time I bought a pair I had to get a 9.
I really don't think my feet have grown.
Yesterday Meijer had Dockers house slippers on sale for 50% off and I was ready for a new pair. Medium was supposed to fit 9 through 11. They fit me but snug and no way would they fit someone with size 11. Manufacturers found out that they could make all their clothes just a tiny bit smaller they could save lots of money in the end.
They think no-one will notice.
Like all the other "downsizing", it's an insult to our intelligence but there's absolutely nothing we can do about it.....