From CosplayWiki

Convincing others that you are a woman need not be difficult. People are generally willing to believe that what they perceive is, in fact, reality. Clothing, hairstyle, and mannerisms can be very convincing.

Steps

1. Smooth your face. A heavy beard is a dead giveaway. You may need to shave two or more times a day, or try waxing for a smoother look. At the extreme, you could get laser hair removal, if this is how you want to always be perceived.

2. Use makeup judiciously. Well-done makeup will make you look feminine and pretty; over-done makeup makes you look like a drag queen.

3. Pluck and shape your eyebrows, or, as for your beard, have them waxed into shape.

4. Have your hair styled professionally. It can be very short but still feminine if done properly.

5. Wear scarves or turtlenecks to cover a prominent Adam's apple.

6. Shave, wax or otherwise remove excessive hair on exposed body parts.

7. Widen your eyes often to make them look bigger. This will not only make your eyes feminine, but your entire face.

8. Practice moving like a woman. Observe women whom you admire and mimic their movements and mannerisms. Don't over-do it however, or you will look ridiculous. High heels require years of practice to look at ease in, wear flats until you are skilled.

9. Pay attention to your hands. Nails should be tended, not rough or torn. Keep your hands moisturized and soft.

10. Select clothing carefully. You need to be comfortable as well as womanly. Undergarments can provide the needed curves. You will need some snug-fitting panties to keep your manly curves contained and un-obtrusive. A spandex girdle will work wonders.

11. Look in the mirror a lot - observe yourself in repose and in motion. Practice, practice, practice until it is second nature to move and act like a woman.

12. Pitch your voice carefully. Too high and you'll squeak, too low and people will wonder.

13. Dress simply. Anything over-the-top is a dead giveaway.