Yes another one, I've been having fun. Clint Barton was orphaned hours after his birth. When he was about six he ran away to the circus and became an acrobat and trained in the bow and arrow, getting the nickname Hawkeye. Once he became 18 the circus told him about their thievery of the guests. Clint easily became a professional at this. He eventually started robbing breaks until in one of Iron Mans early days he came into a battle with Iron Man resulting in Clint to go to prison. Clint finished his sentence and went to a normal life. Only a few days later S.H.I.E.L.D. recruited him for the skills he got from his circus. He became one of the best stealth agents in only a year. Eventually, Nick Fury sent him and his partner, the Black Widow, to make sure the Avengers 'stayed inline'. Hawkeye and Black Widow eventually left S.H.I.E.L.D. and joined the Avengers and became one of the most reliable members of the team.

Avengers Uniform
The Avengers Uniform was designed by Tony Stark and made with technology Hank Pym, the Ant-Man, made. Bruce Banner and Hank Pym (who originally declined to be an Avenger) then made the uniform for each Avenger and still continue for new Avengers.