Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.

 

If you intend to uplift the state of major ritual impurity by just making ghusl, you can immediately make prayer afterwards. This is the view of Shafi`i scholars. They based their view on the fact that when a major state of ritual impurity is lifted, it consequently uplift the minor state of ritual impurity. The condition is that you perform an obligatory ghusl such as after having sextual intercourse or after being purified of menses.

 

Since there are many reasons that may expose a woman’s body to be shown such as taking photos by those who are not honest and due to the exposition of areas which are haram to show in front of women such as the area from the knees to the private parts and the areas below chest, it is not permissible for a Muslim woman to wear swimsuits in front of other women.

 

Allah Almighty knows best.