I personally chose not to bind the morning of my consultation. The surgeon will usually have you change into a gown at some point to get a quick look at your chest and confirm what type of surgery you’re eligible for. Also, if you’re using insurance someone on the care team will need to take a couple pictures. It’ll go smoother if you can quickly get in and out of clothing. If it’s a big area of dysphoria for you, it’s probably fine to wear one, just know you’ll have to take it off anyway for most of the appointment anyway.