Two priests decided to go to Hawaii on vacation.

They were determined to make this a real vacation by not wearing
anything that would identify them as clergy.

As soon as the plane landed, they headed for a store and
bought some really outrageous shorts, shirts, sandals,
sunglasses, etc.
The next morning, they went to the beach, dressed in their
"tourist" garb. They were sitting on beach chairs, enjoying
a drink, the sunshine and the scenery when a "drop dead gorgeous",
blonde wearing nothing but a thong came walking straight towards
them.

They couldn't help but stare. As the blonde passed them, she smiled
and said "Good morning, Father. Good morning, Father,"
nodding and addressing each of them.

They were both stunned. How in the world did she know they were
priests?
So the next day, they went back to the store and bought even more
outrageous outfits. These were so loud you could hear them before
you even saw them.
Once again the two priests (incognito) settled on the beach, in
their chairs to enjoy the sunshine. After a while, the same
gorgeous topless blonde, barely wearing a string, taking her sweet
time, came walking toward them. Again she nodded at each of them,
said "Good morning, Fathers," and started to walk away.
One of the priests couldn't stand it any longer and said,
"Just a minute young lady."
"Yes?" she replied.
"We are priests, and proud of it, but I have to know, how in the
world did you know we are priests - dressed as we are?"

She replied, "Father, it's me. . Sister Mary Frances!"