Apparel Search fashion summary — a short guide to fashion synonym.
It is all about the words, so use them wisely. A synonym is a word or phrase that means exactly or nearly the same as another word or phrase in the same language, and words that are synonyms are said to be synonymous. Fashion's vocabulary is full of near-synonyms that are not quite interchangeable — and the differences are where the useful knowledge sits.

Is clothing a synonym for apparel? Nearly, but not exactly: clothing is not as broad a category as apparel. Some people consider jewelry to be apparel; jewelry is not clothing. Is shoes a synonym for footwear? Footwear includes shoes, boots, sandals and more, while a shoe is a covering for the foot, typically made of leather, having a sturdy sole and not reaching above the ankle — so every shoe is footwear, but not all footwear is a shoe.
Are coats and jackets synonyms? Coats are longer than jackets, and the linked page on the difference between coats and jackets works the distinction through. Even trendy and stylish, the pair this subject starts from, differ in emphasis: trendy describes following the current trend, stylish describes dressing well whether or not a trend is involved. Precision here is not pedantry — a buyer, a pattern cutter and a shopper each lose money or time when a near-synonym is treated as an exact one.
If you want to truly understand synonyms, read a thesaurus: a dictionary of words with the same or nearly the same meanings, and their opposites, or antonyms. A good thesaurus helps master a language, and for fashion it maps the vocabulary's families — the fashion entry on Thesaurus.com is linked from this page, alongside the fashion glossary, fashion terms and fashion definitions resources.
The fashion word list runs: style, look, chic, vogue; trend, trendy, swank; make and construction; fad and craze; contemporary and modern; classic and popular. Each cluster shares a centre but not a boundary, which is why the fashion styles summary can ask whether the term fashion styles is itself redundant — a fair question, and a good exercise in exactly the distinctions this page teaches.
Fashion's near-synonyms persist because the trade needs the distinctions they carry. A buyer ordering apparel and a buyer ordering clothing are instructing different suppliers; a pattern marked coat and one marked jacket will be cut to different lengths by different conventions; and a merchandiser who calls everything footwear loses the information that boots, shoes and sandals sell in different seasons to different customers. The thesaurus shows the words clustering together, and the industry's usage shows them being pulled carefully apart — both views are correct, at different distances. For writers the lesson is practical: the fashionable synonym is tempting in a sentence that needs variety, but in specifications, product names and care instructions the exact word should be repeated without embarrassment. Elegant variation is a literary virtue and a manufacturing defect. The fashion glossary and definitions resources linked from this page exist to settle, word by word, which side of each near-synonym a given garment actually sits on.
A word or phrase that means exactly or nearly the same as another word or phrase in the same language. Fashion's key pairs — clothing and apparel, shoes and footwear — are near-synonyms with real differences.
Apparel is the broader category; clothing is narrower. Jewelry, for example, can be considered apparel but is not clothing.
Mainly by length: coats are longer than jackets. The linked coats-versus-jackets page works through the distinction in detail.