This was originally part of a costume (I was playing a tree in a LARP game/party thing), but after that I ended up wearing it just because. After a while the armpit area became bleached from deodorant I was using that had baking soda in it (it also bleached my armpit hair LOL, as I realized at some point it was starting to look orange so I stopped using it). So I decided to add the embroidery as a way to cover up and distract from the bleaching.
edit:
I will add that figuring out how the material behaves took a while, I used an embroidery hoop but the material is very stretchy and sheer. So it was pulling a lot and took a lot of patience in learning how the material responded and worked but I persevered and it worked out. Just a warning if you will work with similar material it takes time understanding how it pulls and so on.
edit 2: people kept on asking how it feels, I already answered this several times, pasting one of my responses here - "I'm wearing it like the third time now and I can't really say it feels like much of anything. Maybe I can feel that there is a tiny bit more bulk there from the embroidery floss, but embroidery floss is soft and it's not irritating. I forget what it's called (this layer of thing you can put under embroidery) but I did not use it. Just went straight onto the material. It might be that I am not bothered or it's just not much to be bothered by. Could also be that my own hefty amount of underarm hair is also cushioning me from feeling much else there."