My "decision weight" is not any one daily weigh-in. Those are almost meaningless because of how volatile water is. I use a weight-smoothing app to see where I'm trending.
Our bodies are not mostly composed of fat, they're mostly composed of water. Therefore, most of the weight changes we see from day to day are water changes, not fat changes.
Use a weight-smoothing app called Libra (for Android) or Happy Scale (for iPhone).
One of these apps will help you see the trends better with less of the volatile influence of water.
Once I've decided the trend is too high in my 10 pound maintenance range, I'm going to be on -500 for weeks. I don't come off of it until I'm low in my range. When I start, I don't stop until I lose 5-7 pounds on that trendline. It won't be a day or two. It's going to be weeks.
This was a godsend for me for walking/running after some surgery that made belly jiggle quite painful while healing.
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https://www.amazon.com/Heathyoga-Leggings-Workout-Running-See-Through/dp/B07DKDQPM3
I use this brand. I like the 9" inseam shorts because I also have loose thigh skin. The band is wide and designed to be high waisted, but idk how it compares to other leggings, it might be pretty similar to what has already failed you.