We have talked many times about the classic dapper gray suit. It is the best thing to add to your wardrobe. You can wear it with out without a tie. Don’t forget the pocket square and don’t forget that shoes matter. This suit from Express.
Casual: don’t wear a tie with a button collar oxford dress shirt. You can even wear it with sneaks.
Dress: wear a fresh fabric tie with the dress shirt. Wear it with wingtips.