King of cheap here.

Dri-ducks Poncho worked for me. ($15 sale priced most times) Plus it's still my daytime rain gear while hiking.

1.I made small slits on the end hem and threaded a string through. With a cable lock , this allows me to trim the ends.

2. I sewed fabric loops on the four corners. When I use it as an UQ, I add elastic line and two cheap carabiners to fasten to the suspension.

I've only used it to windbreak my underquilt, which loses all insulation capability when the wind blows, but, no reason it wouldn't windbreak with nothing else under it.