Hmmm, I'm kinda doing the same as you, with the opposite intention. I.e., I'm wearing bigger pants and noticing how much room to move there is, and how tight my belt still has too be as I try to put
on weight.
It was a confusing feeling to put on a pair of pants I just bought about a year ago and find that they're too tight to wear comfortably. I really liked those pants so I felt simultaneously good that I was obviously putting on weight, and bad because I could no longer wear them.
Keep up the good work