The test has two parts: the clothing must be required or essential for your work, and it must not be suitable for everyday wear. A regular suit or normal clothes fail the second part, even if you only wear them for client meetings, because you could wear them elsewhere.
What does qualify: a uniform with a company logo, safety equipment like steel-toe boots and hard hats, and specialized protective or costume clothing that you would not wear in ordinary life. Cleaning and maintaining qualifying work clothing can also be deductible.
If in doubt, ask whether a typical person could reasonably wear the item outside work. If yes, it is personal; if no and it is required for the job, it may qualify.

