Why would I buy lingerie as a gift?

I can't say exactly, but I'm buying lingerie for a friend's surprise event. I don't know what to get her.

Frederick's of Hollywood, which is so much cheaper than Victoria's Secret

Emily Babydoll $25


Sheer Stripes $10 + $15


Marilyn $15


Chic Satin $10 + $15


Risque Romp $20 + $7