High water

All of my two and three year old pants seem too high off my shoes. For example, I have a pair of wide-wale cords that I swear once brushed the top of my shoes. Now, they seem to rest about an inch above my shoes. As everyone has reminded me, I've steadily gained weight over the last few years. Could I also have gained some height? I'm now buying pants that rest over my shoes, but, really, I don't think I bought my pants that high in the past. Do they shrink over time?