Whatever you like as long as it is comfortable and easy to move in. Remember the sessions are for learning so save the LBD for the milonga. Expect to get warm so make sure that you smell good (not overpowering) beforehand and are able to stay that way (spare shirt?).
Shoes should be thin soled and not sticky, you will need to pivot (turn) in your shoes. A strap holding your foot in your shoe is important (no flip flops or slip ons)and a lower heel is advised for ladies who are starting out.
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