Peace be upon you. According to Grand Ayatollah Sayyid Sistani, it is necessary to wear gloves. Yes, handshaking between a man and a woman is permissible if done through clothing or gloves, provided there is no risk of falling into what is forbidden. According to Grand Ayatollah Sayyid Khamenei, wearing gloves is also required. Touching a foreign hand with a barrier is permissible in itself, as long as it does not lead to arousal or any harmful consequences. The prohibition against arousal is based on obligatory caution unless there is no harm or fear of falling into what is forbidden. May you be successful in all good.