Editor’s Note: This guide was reviewed and updated for 2026 — with new sections added covering semi-formal/cocktail attire and smart casual, plus a quick-reference formality guide to help you decide fast.
If you are a man trying to choose something to wear, this is your guide.
Let’s be honest: it’s not always easy to know exactly what to wear, especially when you want to be on your A-game at the office, happy hour, or a special event.
With so many dress codes in play these days — and unspoken rules about when and how to wear each one — you never want to show up under- or over-dressed.
If you need help decoding dress codes and making sure you have everything you need to pull off any look, we’ve got you covered — from the most formal occasion to a lazy Sunday.
Quick Reference: Formality, Most to Least
- White or Grey Tie — black tailcoat, waistcoat, formal accessories
- Black Tie — classic tuxedo
- Semi-Formal / Cocktail — dark suit, tie optional
- Traditional Business — suit, dress shirt, tie
- Business Casual — chinos, button-down or polo, no tie required
- Smart Casual — dark jeans or chinos, polished layers
- Casual — comfort-first, everyday wear
White or Grey Tie
The most formal of all dress codes, white or grey tie attire is reserved for high-society events.
It requires many intricate pieces: a black tailcoat jacket, stiff-front dress shirt, waistcoat, trousers, formal pumps, and accessories like a boutonniere, bow tie, handkerchief, and even gloves.
Related: Men’s guide to looking handsome
You’re likely to encounter black tie far more often than white tie, but always check the invitation for the event you’re attending to be safe.
If you’re stuck or the attire isn’t explicit, collect context clues from the venue, look up photos from previous years of the same event, or ask another guest who’s attended before.
When to Wear:
- State dinners
- Formal balls
- Some weddings
Black Tie
Black tie is more common than white tie when people say “formal.” It’s a strict dress code, but without the intricacy of a tailcoat, gloves, and a boutonniere.
It’s essentially a simplified version of white tie, built around a classic black tuxedo jacket.
Watch for variations, too, like black tie optional and creative black tie. Optional means a suit is acceptable, though you can still wear a black tuxedo if you’d like. Creative gives you room to have fun — a rose-colored tuxedo jacket, a bold bow tie, or a patterned pocket square can all work here.
If you’re attending a work event and want to look polished while still standing out, work a conversation-starting detail into your look.
When to Wear:
- Evening weddings
- Fundraisers
- Galas
Semi-Formal / Cocktail Attire
Semi-formal — often labeled “cocktail attire” on an invitation — sits between black tie and traditional business. It’s dressy enough for an evening event but doesn’t require a tuxedo.
The base is a dark suit (navy, charcoal, or black) paired with a dress shirt. A tie sharpens the look, but many semi-formal events are fine without one — especially if the invite says “cocktail attire” rather than “cocktail formal.” Leather dress shoes and a matching belt finish it off. A pocket square is a nice, optional touch for something like a rehearsal dinner or a holiday party.
The easiest way to miss this one is by defaulting to a full business suit and tie when the room is actually going tieless with open collars, or vice versa — showing up too casual for what’s meant to be an evening-dressy event. When the dress code just says “semi-formal” with no further detail, a dark suit with a tie is the safer bet; you can always remove the tie once you see the room.
When to Wear:
- Cocktail parties
- Rehearsal dinners
- Evening receptions and holiday parties
Traditional Business
Business attire is the most common way to “dress up” in day-to-day life. Also known as business professional, it’s built for the workplace and other events that don’t call for a formal dress code.
Dressing to impress is a key part of positioning yourself for growth at work — it signals professionalism and effort before you say a word.
The look typically consists of a suit in a basic color, a plain long-sleeved shirt, a tie, dark socks, and professional shoes.
Not every office requires business attire, but it’s always safe to lean business professional when you’re entering a new workplace or heading into an important meeting.
Worried about being overdressed for a post-work get-together? Lose the jacket, roll up your sleeves, and you’re perfectly suited for happy hour.
The most important thing to keep in mind is that your suit fits properly — that’s what makes the difference between looking tailored and professional versus just looking like you own a suit. Look good, feel good.
When to Wear:
- Interviews
- In the office
- Holiday parties
- Networking events
Business Casual
Business casual is a sharp, more wearable everyday look. You get more freedom here — it doesn’t require a suit to pull off.
The basics: chino pants, dark-wash jeans (depending on the setting), polo shirts, long-sleeved button-downs, sweaters, leather shoes, and a belt. Mix and match these staples however you like for a put-together, versatile look.
This dress code leaves room for personal style, so don’t be afraid to play with color and texture to stand out at the office.
When to Wear:
- In the office (dress code permitting)
- Wakes, funerals, and memorials
- Everyday wear
Smart Casual
Smart casual is the most flexible — and most misunderstood — dress code on this list. It asks for the comfort of casual clothes with the intention of business casual, and it shows up constantly on invitations for dinners, date nights, and after-work events.
Build it around dark jeans or chinos, a well-fitted button-down or a quality knit polo, and clean leather shoes or minimalist sneakers. A blazer or unstructured sport coat instantly elevates the look if the setting calls for it. The line to stay on the right side of: everything should look intentional, not thrown together. Ripped denim, graphic tees, athletic wear, and sandals fall outside the code, even at its most relaxed.
When to Wear:
- Dinner reservations and date nights
- After-work social events
- Smart-casual-designated weddings or parties
Casual
Casual and ultra-casual clothing is usually reserved for your personal, off-the-clock life. It prioritizes comfort over formal, uniform looks. The denim look is usually fine here.
Depending on where you work — a non-uniform retail job or a casual office, for example — this dress code might extend into your everyday work life too. Always check your employee handbook or ask a supervisor before making that call yourself.
A casual dress code at the office doesn’t mean you can’t elevate your style toward business casual. It typically just means that too-short shorts, flip-flops, baggy sweatpants, and ripped clothing are off-limits.
When to Wear:
- Relaxed office or work settings (dress code permitting)
- Everyday wear
- Weekends
Wrap Up
If you’re like most men, figuring out what to wear can be a real chore. Hopefully, this guide has made the decision a little easier.
For more style ideas, check out the book Dress Like a Man by Antonio Centeno (Amazon). It’s full of practical ideas to help you look sharp.
Frequently Asked Questions
What’s the difference between black tie and semi-formal?
Black tie means a tuxedo. Semi-formal (cocktail attire) means a dark suit, with or without a tie. If the invitation just says “formal” with no other context, black tie is the safer assumption; “semi-formal” or “cocktail” points you to the suit.
Is smart casual the same as business casual?
No. Business casual leans toward the office — chinos, button-downs, sweaters. Smart casual leans toward social settings — dark jeans, knits, and sneakers are all fair game as long as everything looks intentional.
What should I wear if the invitation doesn’t specify a dress code?
Look for context clues: the venue, the time of day, and who’s hosting. Evening events at upscale venues lean semi-formal or higher; daytime or casual venues lean business casual or smart casual. When in doubt, it’s easier to dress down a step than to be the most overdressed person in the room.
Can I wear jeans to a business casual event?
Dark-wash jeans without rips or fading can work for business casual, depending on the office or event. Paired with a button-down and leather shoes, they read as intentional rather than sloppy. Light-wash or distressed denim is safer left for casual settings.
What’s the most formal dress code for men?
White or grey tie. It’s reserved for high-society events like state dinners and formal balls, and it calls for a black tailcoat, stiff-front dress shirt, and formal accessories — well beyond what a standard tuxedo covers.
