What is the ruling on a woman wearing bodysuits and stretch clothing inside the home, and is this considered an imitation of disbelievers?

Wearing these clothes does not constitute imitation of disbelievers, because they are worn by disbelieving women and others. Such a case does not fall under the forbidden imitation. If a woman wears these clothes in her home, it is not permissible for her to appear in them before those who are not allowed to look at her in such a state, even if they are mahram (definition) relatives or women like her, due to regulations concerning what parts of a woman's body it is permissible to look at.