Yes, when someone chooses to purchase an event ticket, my additional fields do show-up, i.e. a drop-down box for a t-shirt size.
Once the ticket is submitted, the information from the additional field is not being carried over to the attendee page. When I export the data, the column is there with the correct title (i.e. T-Shirt Size) but no data is there. My additional field is required for the ticket to be purchased.