How did スマート (from 'smart' in English) shift to mean 'slim, trim' and 'stylish'?


I first learned of this loanword on [/r/FalseFriends](https://redd.it/3bu20c).
[Wiktionary:](https://en.wiktionary.org/wiki/%E3%82%B9%E3%83%9E%E3%83%BC%E3%83%88)

> ### Etymology
>
> From [English](https://en.wikipedia.org/wiki/English_language "w:English
> language") _[smart](https://en.wiktionary.org/wiki/smart#English "smart")_.
>
> ### Adjectival noun
>
> **スマート** ( _-na inflection_ , _rōmaji_
> **[sumāto](https://en.wiktionary.org/wiki/sum%C4%81to#Japanese "sumāto")** )
>
>   1. [slim](https://en.wiktionary.org/wiki/slim "slim"),
> [trim](https://en.wiktionary.org/wiki/trim "trim"),
> [slender](https://en.wiktionary.org/wiki/slender "slender")
>   2. [stylish](https://en.wiktionary.org/wiki/stylish "stylish")
>

  1. What type of [semantic shift](https://en.wikipedia.org/wiki/Semantic_change#Typology_by_Blank_\(1999\)) is this?

  2. Please see the titled question.




This is not a semantic shift nor are they false friends. In English, _smart_
has several distinct meanings. It has been used for to look stylish for a long
time. It is _still used_ for this meaning, albeit less commonly and mainly in
British English varieties. Using it for intelligence is more colloquial and
has developed more recently (and is more common in American English
varieties).

> **smart adjective** (STYLISH) mainly UK
>
> having a clean, tidy, and stylish appearance.
>
> **smart adjective** (INTELLIGENT) mainly US
>
> intelligent, or able to think quickly or intelligently in difficult
> situations.
>
> [Cambridge
> Dictionary](https://dictionary.cambridge.org/dictionary/english/smart)
>
> [Oxford Dictionary](https://en.oxforddictionaries.com/definition/smart)

The Japanese スマート has been derived from the _original_ meaning. Of course, the
Japanese language is changing as well, it is now also used for smartphones,
just as it is in English.

