This is as basic as it gets, I simply placed a softbox behind her in order to get a perfectly white background and exposed so that she was in complete silhouette. I take a photo like this of nearly everyone that I photograph, with this photo of Allison being one of my favorites.
Camera info:
Sony a7
Zeiss Batis 85mm f1.8 OSS
f5
1/200s
ISO 100
Big thanks to 
Leave a comment below if you have any questions! :)