The Peekaboo skin is an Epic Fortnite outfit. Peekaboo was available via the Item Shop for 1500 V-Bucks and you can buy it from Fortnite Item Shop when it will listed.
Fortnite Peekaboo Outfit Details
I see you!
Fortnite Peekaboo Outfit PNG Images
Here is the PNG images of Peekaboo below!