| Costume | Unlock |
| Sneaking | Clear Main Op: Attack Chopper Battle MI-24A |
| Battle | Complete Main Op: Peace Walker Battle |
| Battle W/H | Clear an Outer Op with S+ difficulty |
| J.Fatigues | Initial equipment |
| Leaf | Clear Extra Op 14 with S rank |
| T.Stripe | Main Op: Pursue Amanda, Bananal Fruita de Oro area |
| Choco Chip | Clear Extra Op 45 with S rank |
| Auscam | Main Op: Destroy the Barricade, Aldea Los Despiertos area |
| Squares | Extra Op 30, Bananal Fruita de Oro area |
| Splitter | Extra Op 29, reach with box drop |
| Snake | Main Op: Travel to Cloud Forest, Selva del la Leche: Hillside area |
| Neo-Moss | Extra Op 62, use radio near first ghost until the message "This is The End" |
| Stench | Clear Extra Op 61 with S rank |
| Tigrex | Clear Extra Ops 123 & 124 with S rank |
| Rathalos | Clear Extra Ops 121 & 122 with S rank |
| Gear Rex | Clear Extra Ops 125 & 126 with S rank |
| Naked | Initial equipment |
| NKD(Leaf) | Unlocked with Leaf |
| NKD(Tiger) | Unlocked with T.Stripe |
| NKD(Choco) | Unlocked with Choco Chip |
| NKD(Ausy) | Unlocked with Auscam |
| NKD(Sqrs) | Unlocked with Squares |
| NKD(Split) | Unlocked with Splitter |
| NKD(Snake) | Unlocked with Snake |
| Tuxedo | Clear Main Op: Peace Walker Battle 3 |
| Amanda | Clear Extra Op 67 with S rank (female only) |
| Miller | Clear Extra Op 68 with S rank (male only) |
| Bikini | Clear all Main Ops and Extra Ops (female only) |
| Swim Trnks | Clear all Main Ops and Extra Ops (male only) |
| T-Shirt | Search Extra Op 001 |
| R.Commando | Clear Extra Op 37 (male Versus only) |
| R.Soldier | Clear Extra Op 24 (male Versus only |
| Scout | Clear Extra Op 61 (male Versus only) |
| Guard | Clear Extra Op 38 (male Versus only) |
| Commando | Clear Extra Op 9 (male Versus only) |
| M.POW | Clear Extra Op 52 (male Versus only) |
| F.POW | Clear Extra Op 55 (male Versus only) |
| Patrolman | Clear Extra Op 11 (male Versus only) |
| Mechanic | Clear Extra Op 66 (male Versus only) |
| Escort | Clear Extra Op 27 (male Versus only) |
| Black | Initial equipment |
| Khaki | Initial equipment |
| Navy Blue | Initial equipment |
| White | Initial equipment |
| Red | Initial equipment |
| Yellow | Initial equipment |
| Pink | Initial equipment |
| Green | Initial equipment |
| Water | Initial equipment |
| Tree Bark | Initial equipment |
| DPM | Initial equipment |
| Comrade | Initial equipment |
| G&J | Initial equipment |
| NKD(Black) | Initial equipment |
| NKD(Khaki) | Initial equipment |
| NKD(N.Blu) | Initial equipment |
| NKD(White) | Initial equipment |
| NKD(Red) | Initial equipment |
| NKD(Yelw) | Initial equipment |
| NKD(Pink) | Initial equipment |
| NKD(Grn) | Initial equipment |
| NKD(Watr) | Initial equipment |
| NKD(T.B) | Initial equipment |
| NKD(DPM) | Initial equipment |