|The following is based on Fallout Shelter and some details might contradict canon.|
'Tis the season to prove Santa still visits your vault - even if it doesn't have a chimney.”— In-game description
The Santa suit is a red suit with white trim, and includes a red hat with white trim. It provides +3 perception and +2 charisma to its wearer.
- Found by dwellers exploring the wasteland
- Found in lunchboxes
If successful attempt disassembly of outfits you can get junk:
Santa suit (1)
Free space in the storage room
Baseball glove (4)
Teddy bear (2)
The outfit was added with the 1.2 update, two weeks before the start of the winter 2015 Holiday season, with events like Halloween and Christmas coming up.