Colonel Autumn's uniform

Col. Autumn's Uniform is worn by Colonel Autumn.

Obtaining
Method 1) There actually is a way of getting this outfit before the end of the game in the PC version. During the Waters of Life quest after Colonel Autumn supposedly "dies", you can grab his belongings as long as he falls near the door. You must face directly towards the body with the cursor directly on the body in first person view. Once this is done, hold down the button that changes the perspective and you should be able to rotate the camera. Rotate the camera half-way and you should see a "Search Colonel Autumn" message. Voila! You can also search Dad and possibly everyone in the room if they fall close enough to the wall.
 * Colonel Autumn does not have his Laser Pistol during this part of the game.

Method 2) If you have missed your chance in the above method you still have another. After you have finished the American Dream Quest (the one at Raven Rock) and BEFORE you activate the robot Liberty Prime (aka the very last mission) fast travel to Rivet City. Once here travel West to the Jefferson Memorial and you should see the blue energy shields. Since you should be coming from the West side go up to where the energy shield cuts off and where the generator is, make a save here. The reason for the save is that when you are jumping over these rocks it is possible to get permanently stuck, any who continue jumping and you should make it over the rocks. The hole in the rocks is under the "stairs", not between the stairs and energy shield generator. Once that is over make your way inside the Gift Shop and into the Rotunda (there will be Enclave Soldiers in the gift shop). Col. Autumn will be standing in there like he is on the final mission but he will not talk with you. You now need to reverse pickpocket a suit of armor onto him that is in good condition (I used Enclave armor). After that leave the room and then re enter, Col. Autumn should be wearing the suit of armor you just put onto him allowing you to pickpocket his outfit.

Note: Probably unrepairable by other clothes. So we'll never fix it up to 100% again. Also I don't know if it's only the xbox 360 version, but when you go into the Rotunda there will be someone marked there on the map but no-one will be standing there. [Edit: This glitch does work on the Xbox 360 version. However, reverse-pickpocketing does not seem to work so you are forced to kill Autumn instead.

[Edit : You DO NOT have to kill Autumn to get his uniform, to get his uniform get some Tesla Armor and repair it to the best of your abilities (I was at Level 13 when I did this) also grab a Stealth Boy, use the above Method 2 to get into the Rotunda to find Autumn standing the bottom of the metal stairs. Now use the stealth boy and creep up on him making sure you remain hidden, reverse pickpocket the Tesla armor onto him and leave the Rotunda, now go back in and Autumn should be wearing the Tesla armor and if you pickpocket him again you should be able to take his outfit, Congrats!

Note: When I did this, I killed him to see what happened after I got his uniform. It gave the quest info to "Clear the room", however the Enclave that are in the room when you follow through the quest normally, did NOT appear. So, I had to reload. I don't think this happens everytime, and it happened to me on the Xbox 360 then again on PS3, though.