I have major slippage with binders, even after only an hour or so of wear. I solved the problem by wearing a sports bra underneath an underworks tri top, but with an undershirt on that means I have at least 4 layers of clothing on at any given time, sometimes 5 with a hoodie or sweater, and I think it shows on my back near my collar, making it look weird and poofy.
I tried the long underworks binder, and it was even worse because it was harder to keep pulling down. Are there any of the lesloveboat binders that work really well for big chests and slippage? I would really like to ditch the sports bra underneath all the time, especially when I work out.