Same here; lost 65 pounds and my size 40s (I began in a tight 46) are getting really loose but am not yet ready to drop to a lower size until these are nearly falling off. Besides, I may work my way down to 36s before the Spring. 38s might just be a whistle stop of inexpensive Wranglers.
Saved a lot of my thin pants but I’ve shrunk past them as well. I am now only wearing two pairs of jeans for all occasions. One pair, I believe, are from the '90s and are slim fitting and kind of a very light denim. Daughter said they are retro and look really cool.
Also, my oversized underwear briefs might be the next to go. No longer hold my junk in place. 