Simple, solid colours — both of these work.
You'll get a short prep guide by email after booking. This is the longer version, with the reasoning behind each bit of advice.
Wear something you feel confident in. Solid colours photograph best; avoid busy patterns and big logos. A busy check or a fine stripe can shimmer or strobe on camera in a way your eye doesn't catch in the mirror but the lens will. Big logos date a photo instantly and can look like an ad for a brand that isn't you. Plain, mid-tone colours — navy, charcoal, burgundy, forest green — photograph the most reliably and won't fight with your skin tone or the backdrop.
Bring a second outfit if your package includes a change — and a jacket or layer even if it doesn't. If your package includes a change, a genuinely different look (not just a different shirt in the same jacket) gets you more usable variety — one styled for LinkedIn, one for a more relaxed personal-brand shot, for example. Even on packages without a change, a jacket or cardigan you can add or remove mid-session gives a bit of visual range for free.
Come camera-ready. There's no stylist on set unless you've added hair & make-up. Natural and light works; matte or a quick blot cuts shine. There's no stylist on set unless you've booked the hair & make-up add-on, so do your normal routine as if for an important meeting, not a special occasion. Natural and light works better on camera than anything heavy. If shine is a concern, a quick blot with a matte tissue right before we start does more good than any amount of powder.
A small mirror, a comb and lip balm are worth having in your bag. A small mirror to check yourself between looks, a comb for the obvious reason, and lip balm because dry lips show up more than people expect under studio light. None of this is essential — I'll flag anything visible before we shoot — but it saves a few minutes of back and forth.
Sleep and water the night before do more than any retouching will. A late night shows in the eyes in a way no amount of retouching fully undoes, and dehydration flattens skin in a way lighting can't fix either. If you do one thing to prepare beyond your outfit, make it an early night and a full water bottle the day before.
Simple, solid colours — both of these work.
Send a photo of the outfit before the day and I'll give you a straight answer.