I suggest wearing casual business men's wear, which is simple, fashionable and elegant. You can wear it at work or at ordinary times, even at some informal parties.
No matter what position, wear clean and tidy clothes. You should wear a formal suit for an interview, because it is very hot in summer, so you don't need to wear a suit. Just wear a shirt (don't wear bright colors). Black pants, black shoes and dark socks, preferably black or gray. Never wear white. Salespeople must wear formal clothes because they want to make a good impression on customers. Technicians belong behind the scenes.
If you are doing public relations, girls can not only wear lady's refreshing clothes as mentioned above, but also wear a suit, such as the clothes of a mobile salesperson, with a shirt above and a knee-high suit skirt below. Male friends had better wear formal clothes.
References:
/rzpfang