Collins online dictionary https://www.collinsdictionary.com/dictionary/english/smart smart 1. adjective Smart people and things are pleasantly neat and clean in appearance. [mainly British] He was smart and well groomed but not good looking. I was dressed in a smart navy blue suit. ...smart new offices. Synonyms: chic, trim, neat, fashionable More Synonyms of smart smartly adverb [ADVERB with verb] He dressed very smartly which was important in those days. ...a smartly-painted door.

No, 'smart' doesn't mean 'beautiful' in any form of English. In British English, 'smart' is a way of dressing. As in Chris's dictionary definition, it relates to being neat and well-groomed. For a man, dressing smartly would involve a well-cut suit, shirt and tie, with polished leather shoes; for a woman, it would be a stylish dress/skirt or trousers, sheer tights, high heels etc. Many businesses require their staff to be smartly dressed for work. There's also a category of dressing known as 'smart casual'. For a man, this might be something like chinos with an open-necked shirt and loafers. 'Smart' can also refer to things, such as a smart new car or a smart new building. The connotation here is that they look good and are reasonably expensive, such as a shiny, hi-spec car or an elegant office building. [Just curious. How would American speakers refer to these ideas? 'Smart' seems to be such a handy all-purpose word.]

As an American, although I've used the adjective, "smart," before to refer to a person's style of dress, I've used it as a Britishism. To answer Su.Ki.'s question: I imagine that most of the other adjectives we use would be shared among English speakers. For a man, the adjective "sharp" comes to mind. ZZ Top put their American spin on it here: https://www.youtube.com/watch?v=7wRHBLwpASw. For inanimate things like offices and cars, "sleek" is a good word. Lately, I'll hear the slang, "bougie" for both people and things. This is more of a pejorative word, when you want to give a subtle dig to whatever you are describing.

Thank you Liz! Sometimes I make compliments to the men on the social nets calling them smart. I mean clever, but I am not sure what do they think... I saw once a British man called himself smart because he put on a nice new suit.

I am from the US, but I believe that in the UK they sometimes use "smart" to mean "elegant" or "stylish." Example: "She was wearing a smart outfit."