Dress for the job.
Business professional, in solid colors, in clothes that actually fit — that's 90% of the answer. The last 10% depends on where the photo is going: ERAS, a law firm directory, MBA recruiting, or an internship application. Here's the whole picture, audience by audience.
Every audience below expects business professional. What shifts is how conservative to lean and what the photo sits next to once it's published.
These apply whether you're submitting to MyERAS or a firm directory — and whether the photo is taken in a studio or on a borrowed tripod.
The goal isn't costume. A reviewer who meets you at an interview should recognize the person from the photo — same glasses, same hair, same level of formality you'll actually show up in. The outfit's job is to be unremarkable so your face does the work.
Every session includes a prep guide sent before your appointment that covers all of this against your specific application — part of professional headshots for students across the DC Metro area.
If you're torn between options, bring both — the 20-minute session has room to test each against the backdrop and choose what photographs best.