This awesome Poison Ivy shirt can be purchased at SuperHeroStuff.com. I'm not an affiliate but I have purchased from them in the past and I do recommend them!
I love living in a time when there are so many cool geek related articles of clothing for both men and women. When I was a young geekling this was not the case, even for men. Cool geek stuff was super rare, or not made for an older audience, and of course online shopping was nigh non-existent. Ahh the stone ages. Glad medical science has allowed me to live so long into the future. Now, where are the damn flying cars?!?!