What Is Smart Casual?

What does smart casual mean?

Smart casual is mainly a British social code; in America it is mostly an office one. Cambridge Dictionary labels the phrase UK and defines it as clothing that is 'neat and stylish, but not too formal', with the example 'The restaurant's dress code is smart casual.' Debrett's called it 'by far the most common of all dress codes' in 2023, and in January 2025 described it as a host's request that guests not turn up in everyday leisure clothes: trainers, jogging pants, sweatshirts, hoodies, beachwear and flip-flops. The Emily Post Institute's attire guide has no smart casual entry, so American usage took its meaning from the office. Indeed's 2026 career guide treats it as business casual plus 'trendy clothing pieces such as leather sneakers, bold prints, and statement accessories'. Offices then carried the code into everyday life. On 5 March 2019 Goldman Sachs announced a 'firm-wide flexible dress code' to about 36,000 staff, and Debrett's wrote in 2023 that chinos, jackets and open-necked shirts spread through the City of London after it. On 2 February 2023 the Jockey Club dropped formal dress codes at its 15 racecourses. What is left has two ends: a jacket and possibly a tie at the formal end, dark jeans and a polo shirt at the informal one.

Where smart casual sits on the ladder

Smart casual for women

1. 
   01

   Navy unstructured blazer

   Debrett's puts a jacket at the formal end of smart casual, and Indeed's 2026 guide names an unstructured dark blazer as the piece that looks smart while feeling casual. It also squares up dark jeans, the one way Debrett's 2025 lets denim in.

2. 
   02

   Ivory silk shirt

   Debrett's daytime list pairs dresses, skirts or trousers with silk or printed shirts. Silk in place of a T-shirt is the single swap that moves an outfit from casual to smart.

3. 
   03

   Dark indigo straight-leg jeans, no rips

   Debrett's changed its answer in January 2025: jeans are 'fine' if 'tailored and well-fitted', worn with a tailored jacket. Its 2022 to 2024 pieces called denim too casual, so keep them for daytime and the relaxed end of the code.

4. 
   04

   Midi wrap dress in a small sage-and-white print, cotton or silk

   Debrett's daytime list starts with dresses, and its 2022 heatwave advice, which it applies to social events marked smart casual, names a summer dress in cotton, silk or linen. A small print keeps it daytime; a sequin would tip it into evening.

5. 
   05

   Oatmeal fine-gauge cardigan

   Debrett's names 'chic cardigans' for daytime smart casual and says sweaters are fine when it's cold. A fine gauge over the silk shirt reads polished; a chunky knit reads weekend.

6. 
   06

   Tan leather loafers

   Debrett's tells women to drop high heels for 'kitten heel, flats or loafers' at daytime smart casual. Leather, not canvas, is what separates a loafer from the trainers the code rules out.

Smart casual for men

1. 01

   Jacket or blazer

   Debrett's (2025): 'The best option is to wear a jacket or blazer.' A velvet or Nehru jacket with a patterned shirt is its suggestion for the dressier end.

2. 02

   Chinos or tailored trousers

   On Debrett's list for every version of the code. In summer, its 2022 heatwave advice allows loose cotton or linen chinos in a light colour.

3. 03

   Open-necked shirt with a collar

   Ties are 'generally not necessary', says Debrett's. At the relaxed end a polo or printed shirt works, and a plain T-shirt only under a jacket.

4. 04

   Loafers, brogues or lace-ups

   Debrett's formal smart casual rules out trainers and sandals. At the relaxed end it allows smart trainers or deck shoes, never flip-flops.

Smart casual in winter and summer

Winter. London's December averages 9°C/48°F by day and 3°C/37°F at night (Met Office), so the coat is part of the outfit. Debrett's is specific: choose an overcoat rather than an anorak or parka, and wear a sweater if it's cold. A fine merino under the blazer keeps the line; a fleece breaks it.

Summer. New York's July averages 29°C/84°F by day (NOAA). Debrett's June 2025 guidance says you're generally not expected to wear a tie, and lets knee-length tailored shorts through, never beach shorts. Its 2022 heatwave list adds light cotton or linen chinos, a summer dress in cotton, silk or linen, and no tights.

Reading the invitation

• “Smart casual” — A jacket or a dressy top, no sportswear. A printed card points to the formal end of the code, says Debrett's (2025).
• “No dress code at all” — For a drinks party, Debrett's (2024) says most guests 'will default to smart casual clothing'.
• “Come as you are” — The step below: Debrett's (2022) says hosts write it when jeans, shorts and sports clothes are welcome.
• “Lounge suits” — The step above in British usage: an ordinary business suit, in Debrett's words 'of the sort worn in a formal business context'.

A suggested look — navy unstructured blazer, ivory silk shirt, dark indigo straight-leg jeans, tan leather loafers.

What to avoid

• everyday trainers, jogging pants, hoodies and flip-flops — Debrett's 2025 names these among the leisure clothes a smart casual host wants left at home
• ripped or faded jeans — Debrett's allows denim only when it is dark, clean and well-fitted
• a full-length sequinned gown — Debrett's 2024 calls it over the top for smart casual
• a parka or anorak over a good outfit — Debrett's asks for an overcoat in winter
• opting out because the code is vague — Debrett's says a refusal to comply 'looks rude and contemptuous'; ask a fellow guest or the host instead

Continue planning

• The business-casual capsule

  Fifteen pieces for the office code next to smart casual, with six outfits worked out.