【Stylish】 , 【fashionable】 ,  【modish】 ,  【smart】 ,  【chic】 ,  【dashing】  can mean conforming to the choice and usage of those who set the vogue (as persons of wealth and taste or often the avant-garde).

【Stylish】 is likely to stress currency and, correspondingly, transitoriness.

【Fashionable】  is often interchangeable with  【stylish】 , but  【fashionable】 is distinctly more likely to imply conformance to what is established and generally accepted than to a transitory or restricted vogue.

【Modish】 stresses conformity to the latest styles, but sometimes it suggests a step beyond what is describable as  【stylish】  or  【fashionable】  and may apply to what from another point of view might be called daring , extreme , or startling .

【Smart】  comes close to  【modish】 in suggesting the height of what is 【stylish】 or 【fashionable】 , but it implies a position in the forefront of what is acceptably 【stylish】 or 【fashionable】 rather than one beyond this point.

【Chic】  is sometimes used simply as an equivalent to  【modish】  or  【smart】 or even of  【fashionable】 . However it may not imply conformity to the latest style so much as an effectiveness in style which suggests the exercise of a knack or skill and the achievement of distinction.

【Dashing】 applies to people or to things which they wear or use; it implies not only stylishness or, more often, modishness but a bold, shining quality that enables one to cut a figure in any group or assemblage.