Si quieres saber si la ropa que compras de veras te sienta bien, ve de compras con un amigo sincero.If you want to know if you really look good in the clothes you buy, go shopping with an honest friend.
Considero a Pablo mi mejor amigo porque es un amigo sincero. Jamás me mentiría.I consider Pablo my best friend because he is a sincere friend. He'd never lie to me.