The term 'in fashion' is commonly used to indicate that something is trendy or stylish. However, there are several other synonyms that can be used to convey a similar meaning. The phrase 'on-trend' is often used in the fashion industry to describe products or styles that are currently popular. 'Fashionable' and 'chic' also convey a sense of being stylish and feminine. Meanwhile, 'in vogue' and 'current' suggest that something is up-to-date and relevant. Other synonyms for 'in fashion' include 'popular', 'relevant', 'hip', 'cool', and 'modern'. Whatever word or phrase one chooses, the ultimate goal is to express that something is stylish and fits in with current trends and cultural moments.