Addressing this issue, Sheikh Hatem Mohammad Al-Haj Aly,stated that ‘the woman may dress in front of her mahrams in what is usually worn at home, so uncovering parts of the arms, legs and chest would be allowable. It is also allowed to uncover her hair. The tight clothes are not enough cover, so the clothes should not be too tight to describe the form and shape of the body.
It should be understood that the mahrams are not all the same, so the woman who fears God should be careful in front of a young uncle or the likes. She may have more flexibility with a father or a son provided there is no fear of temptation, but once there is such fear, then she should not uncover even in front of her mahrams no matter how close they are to her.’