The answer is simple.. the kind of clothes you are talking about can be worn at home, in private parties or within the compounds. If ladies wearing such outfits wish to go out to public places, they are expected to don the Abaya over it.

For non-muslims or ladies who do not use the Abaya, are expected to refrain from wearing such garments in public.

Many women have told me that dressing and facial make up is not always to attract men...they do it for their pleasure as well. Most of us feel elated temporarily if we wear a new and nice suite..so I guess the feeling is the same amongst ladies.