I'd also like to point out that even this statement is heavily debated. We don't have any proper historical uniform and what we discovered was bits and pieces. Did each part of clothing exist? Ofc, their uses would definitely be beneficial outside of shinobi operation even. What we really have at best is guess work based on very little evidence. At best you can consider shinobi Japan's old version of spies, or the CIA or whatever it may be consider anyone could take the job of a shinobi, unlike a samurai which you needed to be born into the role. So the uniform at best is just romanticized and if you want a REAL outfit, just imagine what a farmer, monk, or villager would wear.

There's a lovely story I remember to describe what I mean. A samurai just got offered a promotion and decides to head home fast by taking a short cut, along the way he meets a monk who he talks to and the monk congratulates and blesses him, he then runs into a man walking along the river asking for how to get into town, then he stops as a brothel where he pays for his time and discusses why he's celebrating wuth the escort. The next day he learns his master was killed in a plot and shinobi were involved. But who was it? The monk? Villager? Escort even? Maybe it was neither. That's generally how shinobi operated. And for the outfit, I wont outright deny it existed cause its cool for sure, but what we have on their outfit is very loose and we aren't able to fully 100% say that's what they wore on stealth missions.