In Chapter 33 known as al-Ahzab, verse 59, Allah gives the following command to Prophet Muhammad
يَا أَيُّهَا النَّبِيُّ, قُلْ لأَزْوَاجِكَ وَ بَنَاتِكَ وَ نِسآءِ الْمُؤْمِنِيْنَ: يُدْنِيْنَ عَلَيْهِنَّ مِنْ جَلاَبِيْبِهِنَّ...
“O Prophet! Say to your wives, your daughters, and

, and the women of the believers that: they should let down upon themselves their jalabib.” (33:59).

What Is The Meaning Of “Jalabib”?
Jalabib جَلاَبِيْبٌ is the plural of jilbabجِلْبَابٌ , which means a loose outer garment.
Al-Munjid, , defines jilbab as “the shirt or a wide dress—القميص أو الثوب الواسع.” While al-Turayhi, in Majma‘u ’l-Bahrayn, defines it as

a wide dress, wider than the scarf and shorter than a robe, that a woman puts upon her head and lets it down on her bosom
This means that the Islamic dress code for women does not only consist of a scarf that covers the head, the neck and the bosom; it also includes the overall

dress that should be long and loose.
So, the combination of a tight, short sweater with tight-fitting jeans with a scarf over the head does not fulfill the requirements of the Islamic dress code.