I have toyed with all sorts of loadouts. Build an olive one for outdoors a black one and a grey one for CQB even started looking at the belgian camo as it looks great.
Reality is I wear combat trousers, the first colour I grab a long sleeve T and a black belt set up now as I cant be arsed to match everything or buy multiple of every pouch so I can use any gun with any camo etc.
And honestly as mentioned its just for the 'look' or for team identification it can help to blend in, but hardly going to make you super leet invisi predator... Just wear what you like the look of and can afford!
That is unless you are going for a specific unit or look, I started this but got bored and carried loads of gear to emulate a look I didnt need and gave up.