You will need to put your gown on first.
With masters gowns your arm is exposed from the elbow (as shown). With the bachelors gown your arm does not go through the slit in the arm.
You may need to ensure the gown has not slipped back due to the gathering on the yoke.
Open the hood (colours) out and place over your head.
The front part of the hood should show both the red and faculty colour.
Adjust hood on shoulders to ensure it does not fall off (for slight people you may need the assistance of some pins).
Ensure that the colours of your faculty are showing on the shoulders.
Now for the trencher.
The small peak goes to the front.
Put it on your head.
The flat top should be horizontal if not - you have your hat on back to front.