I suppose it depends where you’re based.
Barbour waxed jacket
High quality fabric (cotton, cashmere and silk etc.) No polyester.
Good posture.
I find that navy looks classier than black, others may disagree.
Natural, but well cared for hair.
Ensure your skin and nails are cared for too. There are many great, but affordable skincare products out there. I love the Inkey List!