I am a bit late to the party, but I feel like Squid Game costumes is pretty popular this year. And since they'll do a season 2, I feel like it's a pretty great costume idea in the long run (since Netflix will probably keep pumping it out as long as it's profitable). If you don't want to be super-duper color accurate, you can just wear a hoodie and pants of similar color and just buy the masks.
Bodies grow a lot YoY but heads don't. So it's quite a good idea since you can just buy one mask and have it last for a few years.