Magical Shorts

So I have these shorts that are, like, eternally fit. Like Sisterhood of the Traveling Pants or something! They differ, however, in that they aren't the most flattering pair of shorts ever. But these shorts I've had since I was at least 14 (I'm 19 now) and they've fit.. through all my differing body shapes/sizes they've fit. When I was kinda chubby, really skinny, and now with stupid wide hipbones lol. It's baffling. I'm so frustrated because none of my shorts (that I only bought last year and fit perfectly then) will button anymore. I've gained, maybe, 5 pounds average but that's still really thin. In fact I try not to feel too fat even admitting something like that.. I'm needing to constantly remind myself that I'm still skinny and 5 pounds less would only make me look worse probably and feel unwell. Gosh it's stressful.. but I digress. These shorts still fit me and I find that extremely odd.