Is a woman sinning if she shakes hands with a man when she is wearing gloves?
Praise be to Allaah.
It is not permissible for a woman to shake hands with a non-mahram man even if she is wearing gloves or she shakes hands from under a cloth or abayah. All of that counts as shaking hands even if there is some kind of barrier.
Shaykh ‘Abd-Allaah ibn Jibreen in al-Fataawa al-Jaami’ah li’l-Mar’ah al-Muslimah, part 3, p. 992