I took one of my „statement“ fabrics from the scrap box as the starting point and bought a bit more than usual of matching fabric which was affordable.

That is such a good idea. I am a bargain bin shopper too when I buy fabric, just because of cost - but even more so, I am a reuse-old-clothes-for-their-fabric person. A good idea to get some leeway when you don't quite have enough of one or the other...

I would have never known that the flower fabric was raincoat-like material. You can safely sit on a bench when it's raining now!! :D