The body parts to be shown is reference to those parts to be 'washed' during ablution so by default these must be the minimum that can be seen. How far up the legs, arms etc is not covered by Quran except covering chest and not revealing 'shape' [assets?], so it is left to society to decide how far this can go.
24:30 Tell believing men to lower their gaze, and guard their modesty. This helps them grow in character. Surely, God is Aware of what they do.
24:31 And tell the believing women to lower their gaze, and guard their modesty. They should not show off their adornment beyond what may be decently and spontaneously apparent. Let them cover their chest area with their light covering. They should not let their attraction be apparent to any but their husbands or fathers or husbands’ fathers, or their sons or their husbands’ sons, or their brothers, or their brothers’ sons or sisters’ sons, or their women folk, or what their right hand’s possess, that is, the male attendants who lack all sexual desire, or children who have no carnal knowledge of women. And they should not strike their feet or swing their legs in walking so as to draw attention to their hidden beauty and ornament. O You who have chosen to be graced with belief! Turn all of you together to God so that you may be successful (in establishing a benevolent society). [33:59]
33:59 O Prophet! Tell your wives, your daughters, and women of the believers that they should draw their outer garments around their body (when outdoors). Thus, they will be easily known (as righteous women) and not bothered. God is Absolver of imperfections, Merciful. [24:31. Jalbab = Outer garment = Overcoat = Lengthened dress = Chadar = Shawl = Loose-fitting garment = Modest dress
We know very well that the concept of 'women can wear what they like' is nonsense so decent dress is required, ALONG WITH DECENT CONDUCT, so no blaming 7yr old girls!
7:26 O Children of Adam! We have provided you with garments to cover your bodies as well as to adorn you. The best garment for you to wear, in addition, is good conduct. (Your character decorates you inside out.) These are the verses of God that they must take to heart.
7:27 O Children of Adam! Let not your selfish desire deceive you as it deceived your ancestors, caused them to lose their Paradise, and exposed their imperfections. A host of selfish and rebellious desires lurk within you. You can't even see them but these Satans see you and befriend those who do not believe.
7:28 (As an example) when people commit an indecency they say, "We found our forefathers doing it and God has enjoined it upon us." (Made it natural for us). Say (O Prophet), "God never enjoins indecency. Do you attribute to God that of which you have no knowledge?"
7:29 Say (O Messenger), "My Lord enjoins justice and moderation and to stand devoted to Him alone in complete obedience. Call unto Him, sincere in your Faith in Him alone. He it is Who brought you into being in the first place, and to Him you will return.” (And this is how you can regain your lost Paradise in both worlds.)