What is the ruling on a woman praying in an abaya or similar garment, then separating her legs during prostration, knowing that she is not wearing trousers underneath?

A woman is permitted to pray in an abaya without trousers if it provides complete covering, as the Shar'i dress for women does not have a specific form but rather conditions and specifications. It is recommended for a woman in prayer to keep her limbs close together during prostration, bowing, and all other actions of prayer, so as to be more modest for her.