In amateur competition you are usually allowed to do so. Check with the competition committee of the competition you are playing in, there may be certain conditions in place such as you need a medical certificate.
The only "rules" concerning the leotard is that you cannot wear anything over your leotard (including warm ups or shorts)during competition. Most of the other things concerning the leotard are things such as: you cannot pick a wedgie or pull at your leotard anywhere or the judges will deduct from your score during competitions.
In the last 2 years rules have been relaxed on this issue. Check your club rules to make sure. Some club competitions allow it, but national competitions do not.
That will depend on the style and school that you go to. The rules for competitions will vary from the rules of your school. Ask your instructors for what applies to your classes and tournaments.
Scientific rules and laws concerning thermodynamics.
Free surfing is generally described as surfing with no rules, time limits or judges. It is essentially the opposite of surfing competitions as they have to abide by certain rules.
Have you ever been driving or walking down the street with a friend and for no apparent reason he punches you in the arm and says "Blue Punch Buggy, no punch-backs"? No, he hasn't developed a nervous tic; he's playing the Punch Buggy game. The rules are simple: Whenever you see a Volkswagen Beetle, as quickly as you can, turn to the person nearest you, punch their upper arm firmly, yet gently, and say the color of the car, followed by "Punch Buggy". Remember to say "no punch-backs". If you don't, someone else can punch on the same car, a situation to avoid. And if you have the fortune of seeing a convertible Beetle, you can punch twice. Rules about specific colors and consequences of stating the wrong color vary from region to region. You'll know soon enough if you and your friend have different rules regarding red Bugs, for example. The same applies when you're watching a movie in which a Punch Buggy appears. And if you've rented The Love Bug, it is strongly advisable to establish the rules before watching it.
Demanding that rules concerning behavior are obeyed and observed
Check the rules for the competition as they may have a specific email address just for that competition, however, most of the competitions go to: contests @ moshimonsters.com (Remove the spaces before using.)
Control it with strict rules