Оба варианта правильные, но имеют разные значения. What does she wear? - значит, что она обычно носит, как правило. What is she wearing? - означает во что она одета сейчас, в данный момент.
My best friend is Olga. We study in the same class. She is a very talkative companion. I like to talk to her. We have much interests about sport. Volleyball, skiing, ice skating and rollers don't allow us to miss. It's fun! But we have a different favorite subject in school. I like to learn russian, literature, but she likes maths and phisics. But it's good because we can give some advices about solving homework each other thus we can get good marks for tests. We will never leave each other in the lurch
I would like to tell you about my best friend. She ia a girl. Her name is Olya. We are friends from kinder garden. When we were children Olya was very beautiful and clever girl. She always worn nice clothes and tackled maths tasks very fast. Today Olya is a beautiful, energy and clever girl. She has many different hobbies. Our teachers praise her very often. And many people like her, because she is kind, funny and indifferent girl. I am proud of her. And I am so happy that she is my friend.
Можешь не бояться, я писала сама. Дело в том, что у меня лучшую подругу тоже зовут Оля, и я писала чисто свою точку зрения. Понимаю, что для сочинения это мало, но это просто для примера. Если что-то будет не понятно, я к твоим услугам:)
What does she wear? - значит, что она обычно носит, как правило.
What is she wearing? - означает во что она одета сейчас, в данный момент.