While I have gained weight a bit, I know as a fact that I did not gain a lot from the time I put them in the wash, and put them back on. Same day.
But I think what is happening is they stretch a bit as I wear them and shrink back when I wash them like coldmeat said. Been wearing them all day and they're not bugging me as much as they were earlier. I do plan to go buy more anyway. I was just hoping my washing process was not an issue. I'm still new to the whole doing my own laundry thing. So far I have not ruined anything. I did make the mistake of washing really cheap towels and face cloths with my old ones. lint EVERYWHERE. omg. I actually have to be careful not to wash too much of those cloths at once as the lint was actually bad enough to backup my main sewer line one time, that sucked.