LEG III ITAL ANT marching...

[jvrjenivs]

In more recent times Armies on the march were followed by people who
washed uniforms, repaired items for the troops, and sold replacement items
for the troops. Wasn't that also true in Roman times?

There were dealers for sure travelling with the army to supplie these goods, but as you see here, even after very short useage (I mean, you use your modern clothes also more than 10 days.) they get dirty (and washing those will not make them totally as new. You'll always see dirty marks on it.