Silk ties and first night

Assalamualikum mufti sahab,

q1. is wearing a silk tie haram? reason behind these or is wearing a tie itself haram?

q2. one Muslim gets married, on first night how should the Muslim have sex, I mean to say does one have to take permission from his wife b) both husband and his wife can be naked. what is the Islamic way of doing sex with his wife.