fashion /ˈfæʃn/ (noun) a popular style of clothes, hair, etc. at a particular time or place; the state of being popular Example: The museum's classical architecture has never gone out of fashion
fashionable /ˈfæʃnəbl/ (adjective) following a style that is popular at a particular time Example: It is fashionable to have short hair nowadays.
old-fashioned /ˌəʊld ˈfæʃnd/ (adjective) not modern; no longer fashionable Example: These sweets are still made in the old-fashioned way.
casual /ˈkæʒuəl/ (adjective) not formal Example: These clothes are for casual wear.
vintage /ˈvɪntɪdʒ/ (noun) the wine that was produced in a particular year or place; the year in which it was produced Example: She wore a beautiful vintage dress to the party.
on trend /ˌɑːn ˈtrend/ (adjective) very fashionable Example: That dress is very on trend right now.
fashion icon /ˈfaʃ(ə)n ˈʌɪkɒn/ (n.ph) Example: She is a fashion icon known for her bold style.
designer label /dɪˌzaɪnər ˈleɪbl/ (noun) the name or trademark of a fashion company Example: She only buys clothes with designer labels.
smart clothes /smɑːt kləʊ(ð)z/ (n.ph) Example: She wore smart clothes to the interview.
timeless /ˈtaɪmləs/ (adjective) not appearing to be affected by the process of time passing or by changes in fashion Example: The Mona Lisa is a timeless masterpiece.
well-dressed /ˌwel ˈdrest/ (adjective) wearing fashionable or expensive clothes Example: She is always well-dressed for her job.