I hate to say it but I have a habit of keeping jeans of 32, 34, and 36 inch waists simply from bulking gains from the gym, then cutting to trim the fat, 15-25 lb annual fluctuations were normal for me before this disease, so long before Crohns (BC) I had the habit of retaining clothes for when I upped the calories, and then dropped several inches when I'd carb cycle away some excess fat. I guess I kept that habit because I still plan on continuing that trend of working out and cycling my weight (which is standard bodybuilding practice) and getting to about 220 lbs of 9% bodyfat....as I don't want to let Crohns dictate my life more than I have to allow it. It was horrid enough getting "butt muscles" and having a 33" waist but needing "butt room" via bigger than 33" waist pants. It's frustrating because guy's pants don't seem to be designed to have an ass unless the waist is also like 40 damn inches, and some of us actually do have asses along with smaller waists. Then being bed-ridden robs you of every fiber in your ass....Then even your lower back muscles growing can make the waist tighter...But I'm rambling....
I'd say, like the others, to hold onto them, and just buy some new ones now. I wouldn't go the "belt route" myself because then the pants just look funky on you. Then again that could be because I'm one of the ones to wear athletic fit/form fitting pants/shirts, so I don't like things too baggy. I bet you'll be thankful if you buy some nice ones now that fit real well, naturally, and then it'll also motivate you to stay with a lower waist and fight to stay off pred perhaps too. Buy a nice new pair of pants just for Jillian, and pair it with the wolf shirt.