Chairman’s answer: Oy-y-y, it doesn’t! Back in the day (cue the music), practically everyone wore woodland utilities unless you were a grease-monkey mechanic who worked on vehicles and aircraft, in which case you wore overalls. Sailors aboard ship wore blue dungarees that you may associate with Steve McQueen from the classic movie “The Sand Pebbles” (am I showing my age again?) or khakis (which they still wear). Air crews across the services could get away with wearing flight suits (and probably nothing underneath).
Around the same time, the Army and the Marine Corps sought to bring the “utility” back into camouflage utilities to better blend in with the operating environment with no ironing necessary (comes with creases!). The Marines fielded the now ubiquitous pixel-patterned cammies around 2003 in both woodland green and desert tan (necessitating uniform switches at the beginning and end of daylight savings time each year … don’t ask me why). The Army also fielded the grayish-tan-greenish battle dress uniforms (BDUs) – no mid-year uniform switch necessary (until someone decided to create a newer uniform for deployed soldiers).
The story in Post linked above describes the duplicative morass that I hope someone with balls will fix. Eliminating little things will eventually add up to big(ger) savings – for both the bloated U.S. military bureaucracy, as well as the individual service member who spends an inordinate amount of money on his or her tree suit.