She wears sleeves that are the same colour as her skin, and the abayah may fall back and uncover her arms
We have described the conditions that must be met with regard to Islamically acceptable clothing in the answer to question number 6991. One of these conditions is that the clothing should be thick so that it does not show what is beneath it and so that the colour of the skin cannot be seen.
If a woman wears sleeves that are similar in colour to her skin, and they appear if the abaya falls back from her arms, and a person who sees her thinks that this is her skin, then this is contrary to the purpose for which hijab was enjoined, which is to protect women and to prevent others being tempted by them.
Hence the opening of the sleeve should be narrow so that it will not fall back and show the arm, or clothing that does not attract attention should be worn underneath the abayah.
The aim is not only to cover the ‘awrah with any kind of clothing at all; rather the aim, as well as covering, is to prevent anything that attracts attention and causes fitnah. Hence women are forbidden to wear tight clothes or to wear adorned clothes that attract attention, even if they are covering.
Women are also forbidden to stamp their feet whilst walking so as not to attract attention to their adornment, as Allah says (interpretation of meaning):
“And let them not stamp their feet so as to reveal what they hide of their adornment”
The point is that paying attention to others is required with regard to covering, and the believing woman should be a good example to others and she should not put herself in a situation where she may be accused, and she should not merely be content with doing better than others; rather she should strive to attain perfection to the best of her ability.
May Allah help us all to do that which He loves and which pleases Him.
Allah knows best.