Right or Left

While on my way to Connecticut for a softball tournament today, I noticed a sign on the door at a rest area on the Turnpike which read:

shirt
shoe required

There was no space where an "s" might have been.

So my question is right or left?

The softball tournament is the NEWMAC championships. Wellesley will be playing in the championship game tomorrow. The tournament is taking place at the Coast Guard Academy. On another note it was very odd to be addressed as "maam" after I'd shown identification at the main gate today.