You will see a variety of clothing at the race. The most common clothing is a Speedo swim suit and a singlet for men and a one or two piece Speedo for women.
Some people prefer the suits that have pads.
The draft zone is about three bike lengths, do not follow a bike within that zone. A hat may help keep you cool on the run, if it is quite hot you might want to get it wet or fill it with ice Sunglasses may also make the run more comfortable on a hot sunny day General Drink plenty of fluids before, during, and after the race Pack your gear bag the night before Train with friends or join a triathlon club Go to a triathlon and watch more experienced triathletes, you might pick up some faster methods of changing shoes, etc.