In restaurants,
there seem to be two kinds of waiters.
One is only for clearing the table,
who wears ordinary clothes.
The other is what we think of as a waiter, takes orders and serves dishes,
who wears an uniform.
--I came to this idea by following episode:
In one restaurant,
a man wearing casual carried plates away from the next table.
i thought it's an Austrian manner to do that when we find plates left on the table. so i did same for my table.
Then that man ran up to me to say "no, don't do that!" -not in English but phrase like that.
and In the next restaurant,
when i was looking at the menu outside,
a man wearing a normal jacket came up to me and told me how tasty they are.
Clearing-table man seems to be a Calling-in man.