Yeah you can go in and browse without an appointment but probably wont get an attendants full attention on the weekend.
Yes, the first time I went in I didn't have an appointment.
Your unlikely to get the attention of an attendant on a weekend without an appointment. Saturday's are a very busy day. You can just go in to browse and try things on yourself but if you feel you may need help make an appointment or try going in on a week day morning or afternoon.
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