+1 any fabric, cheap walmart tulle, bedsheets, etc slung under your hammock with a slight gap would work well. Worst-case, safety pins every 6" down the sides might be necessary.
Here's my design thoughts: take a rectangle of tulle about as wide as your hammock, or up to 6" wider.
Sew a channel on each side and pull really light elastic down each side and end. You will probably need corner loops to tie to light elastic for suspension.
The goal is to cinch the ends and sides enough to seal, while leaving the fabric loose under you...
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