If the Mu’dhdhin gave the Adhan for prayer on time and was not late in doing so, then you offered the prayer before it was due, so you have to repeat that prayer.

It is not permissible for a woman when praying to wear tight clothes that forms her `Awrah such as pants or trousers. Even if a woman goes against this ruling and prays wearing these tight clothes, her prayer is still valid, because what is required is to cover the `Awrah, and she has done that.