Professional attire advice that is appropriate for all disciplines is hard to summarize, but I'm going to give it the old college try (ha, ha) in this article. Here are some basic tips that have helped me:
Assembling a Work Wardrobe
Pick solid colors and simpler styles; these are "safe" options that will look effortlessly professional.
Choose durable pieces (especially suit pieces) that can last you many years.
Structured, tailored jackets, trousers, and skirts are more work-appropriate than flowy or tight.
Select items that fit you well and don't require too much special laundry care (you'll thank me later).
Choose supportive, comfortable shoes.
Look for breathable materials to be more comfortable during work.
Include several options for layering.
Suit pieces (jacket, trousers, skirt) in a neutral color are always a good choice.
Make sure all items of clothing cover what they are supposed to.
If wearing trousers, choose ones that are not skintight and that come up to your natural waist. (No leggings)
Clean your shoes before interviewing. (TRUST ME)
Make sure your clothing fits you well and has no holes or stains. Triple-check before you leave the house! (Learn from my fail)
Don't include too much jewelry. One simple piece is enough.
Ask your boss what clothing is appropriate before your first day of work.
Mimic what other workers are wearing after a couple of days of observation.
Be sure to follow safety dress codes if you're working around a lot of machinery.
In general, flip-flops and other open-toe shoes are frowned upon in the workplace, and in some fields they may even be illegal.