The first condition: “That the entire body be covered, save what the Law has specifically exempted.”
This is established in His words, Most High, in Surah al-Nur, verse 31:
“Tell the believing women to lower their gaze, guard their private parts, and not display their adornment except what ordinarily appears thereof. Let them draw their head-covers over their bosoms, and let them not display their adornment except to their husbands, their fathers, their husbands’ fathers, their sons, their husbands’ sons, their brothers, their brothers’ sons, their sisters’ sons, their womenfolk, or those whom their right hands possess.”
And in His words, exalted is He, in Surah al-Ahzab, verse 59:
“O Prophet, tell your wives, your daughters, and the women of the believers to draw down over themselves their outer garments. That is more conducive to their being recognized and therefore not harassed. Allah is ever Forgiving, Merciful.”
In the first verse there is an explicit command to cover every part of one’s adornment and not to reveal any of it before unrelated men, except what may show unintentionally; for that they are not blameworthy, provided they promptly