Keep them as the perfect memento and use them again for your rescheduled physical graduation. Cap Sizes Small = Ideal for 50cm - 54cm Medium = Ideal for 55cm - 58cm Large = Ideal for 59cm - 62cm X-Large = Ideal for 63 cm or more - Graduation Attire - Lancaster University - PGDip - Postgraduate Diploma Gown - Cap & Hood Set - 5'0" - 5'2" - Medium - Evess