Is it permissible for a woman to wear the attire known to be worn by immodest women in front of her husband to keep him chaste, or is this considered imitation of them?

A woman may wear for her husband whatever she wishes, as long as it does not involve imitation of men. It is obligatory for her to wear for him whatever preserves his chastity, even if it is something that immodest women are known for, provided that this is not accompanied by admiration for the immoral women, or a desire to imitate them.