The game has 16 Common Outfits. You'll have a huge surplus of them as you send more and more explorers in the island so consider selling them if your dwellers are all outfitted or you have multiple copies sitting in your inventory.
Outfit | Stat Bonuses |
Armored Vault Suit | P+3 |
Battle Armor | S+2, E+1 |
Combat Armor | S+2, A+1 |
Formal Wear | L+3 |
Handyman Suit | A+3 |
Initiate Robe | C+2, A+1 |
Junior Officer Uniform | C+1, I+2 |
Lab Coat | I +3 |
Leather Armor | S+1, E+2 |
Merc Gear | P+1, A+1, L+1 |
Military Fatigues | S+3 |
Nightwear | C+3 |
Radiation Suit | P+1, E+2 |
Raider Armor | P+1, A+2 |
Wasteland Gear | E+3 |
Wasteland Medic | P+2, L+1 |