Different Tertiary institutes have different requirements for which regalia to wear for conjoint or double degrees.
University of Auckland - Conjoint Degree Set
What to Wear
Bachelor Gown, Degree Hood, Trencher
Students graduating with a conjoint degree are able to graduate at a single ceremony of your choice and wear the one hood for the degree appropriate to that ceremony. e.g. Graduating with BCom/BSc, attending BSc ceremony, must wear BSc hood only.
You may also hire or purchase your second degree hood which can be worn at all other times, except for at your graduation ceremony
AUT - Double Degree Set
What to Wear
- Bachelor gown
- Degree hood or the 2 degree hoods
- Trencher
If you're graduating with a conjoint or double degree, you should choose just one ceremony to attend. You can choose to wear both hoods, or just the hood appropriate to the ceremony you are attending.