- "We've made some modifications to the uniform. I had a little design input."
"The uniform? Aren't the stars and stripes a little... old fashioned?"
"With everything that's happening, the things that are about to come to light, people might just need a little old fashioned."
- ―Phil Coulson and Steve Rogers[src]
Captain America's Uniform were sets of uniforms used by Captain Steve Rogers which served as his outfit during his superhero exploits. Fitting in with his identity as Captain America, each costume had a design representative of America, including his stealth costume, which had a more subtle stars and stripes motif.
Shortly following undergoing the procedure that turned him into a super soldier, Steve Rogers was denied the chance to serve on the battlefields of World War II. Instead, he was offered and accepted a position working with the USO, performing in stage shows to sell war bonds to promote the war. As part of his performance the USO created the image and identity of Captain America to serve as a mascot and symbol of pride for the American people to rally behind and increase support for the war-front. Captain Rogers wore this costume in a number of stage shows in cities across America, as well as in a number of other images and iconography, including a number of fictionalized film reels of "Captain America" leading troops in the war, to help increase morale. 
Original Field Uniform
Captain America's original uniform was an ad-hoc uniform adapted from the costume that he wore in his USO productions. To make the costume less conspicuous and more combat worthy, Steve borrowed the "A" helmet from one of the Star Spangled Singers along with a combat leather jacket, pants, boots and googles. He used it in his mission to save Bucky Barnes and a battalion of P.O.W.s that had been captured by HYDRA.
Strategic Scientific Reserve Field Uniform
Captain America's second uniform was made by Howard Stark. The uniform was made of a carbon polymer flame-resistant jackeet, a pair of custom fitted blue-dyed paratrooper trousers, a bulletproof helmet with a wings motif, rigged combat gloves for extra grip, an utility belt and a handgun holster, combined with with a shield of vibranium for Captain America to protect himself from gunfire.
Captain America used the shield and wore the uniform in all of his attacks on enemy facilities and other missions. He had the shield with him when he crashed in the Arctic Circle and was frozen. Nearly 70 years later, S.H.I.E.L.D. stumbled across the crash site of Captain America's plane. He was found alive, and he had the suit.
First Avengers Uniform
S.H.I.E.L.D. created a new uniform fo Captain America's return, with Phil Coulson providing certain design inputs, feeling an "old fashioned" appearance was needed to inspire others. The suit was a more streamlined version of Captain America's Stark-made uniform, incorporating a high-tech blast resistant stretch fabric serving as body armor.
When Captain America was called to join the Avengers, he adopted the suit, and they were able to take Loki into custody. Captain America wore his uniform once again during the Chitauri attack on New York City. Despite having a slim appearance, Captain America survived a Chitauri energy blast to the abdomen at close range, with no evident penetration.
Loki briefly wore it while disguising himself as Captain America and Captain America wore it for his public service announcement videos. Captain America later used it during the Theft of the Mind Stone, where he fought his alternate past self from 2012, who was also wearing the same suit.
STRIKE Stealth Uniform
Captain America's fourth uniform was a stealth uniform, given to him by S.H.I.E.L.D. for secret missions. The suit was a navy blue, utilitarian-style suit with a Kevlar-based ballistic component that could protect Captain America but at the same time function like a military black-ops uniform. It was used to retake command of the Lemurian Star and to escape from the Triskelion.
Smithsonian Golden Age UniformSTRIKE uniform, Steve Rogers left that suit in a high school gymnasium to be found by S.H.I.E.L.D. and retrieved a costume based on his World War II outfit from a display at the Washington, D.C. Smithsonian Institution in a hall paying tribute to Captain America. It was used in the climactic battle which took place at the Triskelion.
Second Avengers Uniform
This uniform was designed by Tony Stark, who provided equipment for the Avengers. The design is similar to his STRIKE Stealth Uniform, retaining some of its stealthy features, but returning to the red-white-and-blue color pattern.
One of its improvements is a series has strong electromagnetic panels on each of the gloves that allows Captain America to retrieve his shield more easily and attach it to the forearm. It is also more durable than his previous uniforms, being capable of withstanding repulsor blasts.
Third Avengers Uniform
Captain America adopted a modified version of his second Avengers uniform as the leader of a new team of Avengers. The suit is more heavily armored than the previous one, and dispensed with the electromagnets, re-adopting the more traditional straps.
Steve Rogers went on the run. While in hiding, he removed the star from the center of his uniform and disposed of his helmet. Eventually, the entire suit was dirtied into a slightly darker color with more rips around the center, exposing the chain mail/linked scales underneath the outfit.
Fourth Avengers Uniform
Five years after the Snap, Steve Rogers used a much newer uniform that resembled his last one, which had the chain mail/linked scales on it; however, the scales were now exposed, unlike the last one, where it was hidden under the outfit. He later used it during the attack on the New Avengers Facility and their final battle against Thanos and his army.
- According to Paddy Whitaker in The Art of Captain America: The First Avenger, the fabric used to make Captain America's second suit was a ballistic nylon which is the same material they used to make horse blankets.
- ↑ 1.0 1.1 1.2 Captain America: The First Avenger
- ↑ 2.0 2.1 Marvel Studios Visual Dictionary
- ↑ 3.0 3.1 The Avengers
- ↑ Thor: The Dark World
- ↑ Spider-Man: Homecoming
- ↑ 6.0 6.1 6.2 Avengers: Endgame
- ↑ 7.0 7.1 Captain America: The Winter Soldier
- ↑ Captain America: The Winter Soldier Deleted Scene
- ↑ Avengers: Age of Ultron
- ↑ Marvel Studios Visual Dictionary
- ↑ Captain America: Civil War
- ↑ Avengers: Infinity War
- ↑ The Art of Captain America: The First Avenger, pg. 36