Is it permissible for a woman to wear clothing such as "stretch and bodysuits, which are known to be worn by immoral women" in front of her husband with the intention of keeping him chaste, or is imitating them forbidden even in front of one's husband?

There is no harm in wearing these clothes, as long as they are not exclusively worn by dissolute women. A woman may wear whatever she wishes for her husband, as long as it does not violate Islamic law, such as being exclusive to men or a symbol of infidel or dissolute women. The criterion for prohibited imitation is that which is exclusive to disbelievers or transgressors. If something becomes widespread among Muslims and is no longer distinctive to disbelievers and transgressors, then it falls outside the meaning of prohibited imitation. These clothes are not exclusive to dissolute women.