Generally, it's best to err on the side of slightly more formal than casual. Think "business casual" as a reasonable starting point, then adjust based on the specifics.
Factors influencing dress code:
* Field: A conference in computer science might be more casual than one in law or medicine. Humanities conferences often fall somewhere in between.
* Location: Conferences in warmer climates tend to be less formal than those in colder ones.
* Venue: A conference held in a university setting might allow for more casual attire than one at a high-end hotel.
* Specific Conference Guidelines: Check the conference website! Many conferences explicitly state their dress code (or lack thereof) on their website or in their program materials. This is the *most important* source of information.
What's generally acceptable:
* Business casual: This is a safe bet for many conferences. Think khakis or dress pants, a button-down shirt or blouse, a sweater or blazer. Clean and presentable is key.
* Smart casual: This is acceptable for many conferences, especially in less formal fields. Think well-fitting jeans (no rips or distressing), a nice shirt or top, and a blazer or cardigan. Avoid overly casual items like t-shirts with logos, sneakers, or flip-flops.
* Professional attire: In some fields (law, medicine, finance), more formal attire might be expected, such as suits or business dresses.
What's generally *not* acceptable:
* Clothes with offensive slogans or graphics.
* Revealing clothing.
* Extremely casual clothing: Avoid t-shirts, shorts, flip-flops, athletic wear (unless explicitly stated as appropriate), etc.
* Unkempt appearance: Ensure your clothes are clean, ironed, and fit well.
In short: Always check the conference website first. If unsure, it's better to be slightly overdressed than underdressed. Professional and neat appearance demonstrates respect for the event, the speakers, and your fellow attendees.