Which is another thing that the purists don't get. Spend any time out running around and getting up and down and, especially in the summer, you'll have dust in all the creases in your skin, etc. Even in the winter, after a few days in a shell-scrape or a battle trench, you'll be the same colour as your surroundings (and the colour of the water that comes off you in the shower, let alone the water that comes out of your clothes, is alarming the first few times).
Dust and grime get everywhere. DPM patterns can all but disappear. Solid colours can be entirely and uniformly changed. And that's before you get to dye batches, washing and so on.
After a couple of weeks digging in and living rough during the Falklands kerfuffle most people's clothes were peat coloured from the waist down and from a distance the DPM pattern was a generally brownish splodge...
Most people wore the same clothes throughout trying to keep a clean and dry set for as long as possible. You couldn't really dry anything properly in that climate anyway. Once the ceasefire kicked in the dirty gear got stowed away to fest in kitbags etc and the clean stuff came out.
I suspect that WW2 German soldiers would not have had the luxury of a spare set of cloths and simply wore what they had.