Indeed, that is what it looks like. Yet TCD don't have a record of it, apparently. Very curious.
Of course, we don't know how reliable TCD's record keeping is, but you wouldn't have thought it was likely to be sloppy.
PS: Have just been away to double check this thought, but it seems that TCD is one of the few old universities where you don't have to graduate to wear the gown. They have, or certainly used to have, the concept of the 'undergraduate gown' there.