The answers come from
Anesthesia & You... Anesthesia for Ambulatory Surgery, an informational document prepared by the American Society of Anesthesiologists through the cooperative efforts of the Society's Committees on Communications and the Committee on Ambulatory Surgical Care.

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What should I wear?
If at all possible, wear loose-fitting clothes that are easy to put on and will fit over bulky bandages or surgical dressings. Leave your valuables at home.