Why do they call "hat-trick" a hat-trick?

Answer 1

The term was originally used in cricket, and was connected with the custom of giving a hat or cap to a bowler who achieved the feat of taking three wickets in a row. It may be connected with the concept of giving someone their "cap", i.e. acknowledging them as a regular member of a representative team. Another school of thought mentions that a bowler was challenged if he could take three in three. Hats were passed around to collect the odds. The bowler succeeded and collected the large amount of cash. Thus the term hat-trick could have been also derived from this event.

Answer 2

coz...it's a hat-trick