[Cnbaapuy]

Wearing sunglasses in some places is considered as 'impolite or inappropriate', many office buildings, banks, special events, etc. require all visitors/attendants to take off sunglasses, it's security issue.

Normally we wear sunglasses when driving, going to beach areas, and as djaidee mentioned it's more like a fashion accessory. Whenever we plan to have a trip, new sunglasses is always on the list to buy.