We suggest that you dress comfortably. You'll be staying in the resort-like accommodation during the Retreat, so there won't be any formal dinners to attend, but it is a retreat facility, so you might want to dress up for dinner. You will have yoga classes every day, so wear something comfortable and loose-fitting for those. Wear comfortable shoes because you'll want to roam around the wonderful property throughout the day, and pack a jacket for sitting outside by the fire pit at night to watch the stars.