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so my son wants to join the internet world and start to stream his gaming sessions so he wants a green screen.
he's pointed out everything under the sun but i figured i'll just go grab some green fabric from hobby lobby or something and throw that on an old clothes rack that i have.

are any of you familiar enough with this to know if i will run into any problems with my material choice?

There are professional green and blue screens, which sometimes aren't even very expensive. (Check on eBay and Alibaba.)

The material doesn't matter so much as getting an even light on it, avoiding shadows, and having a good distinct colour that you don't find in the clothes the presenter wears. or the stuff he is presenting.