Consider the below photo. This is what I wore to my graduation. This was the second university that I attended (but the first time that I managed to get a degree... long story).
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Rented gown and, er, pennant thing - Arts Faculty at UCC. Shoes - Aldo. Tights - Penneys/Primark. Dress - All Saints. Jacket - Lipsy.
I graduated in September and, as you can see, I'm pretty uncomfortable. I'm really not good with ceremony and I usually end up dressing very inappropriately without really thinking (hence the mini dress in church situation). The shoes clacked on the walk up to the college president. He gave me an odd look due to the studded lapels poking out over the gown. The purple tights were a bit of a standout in the class picture. All in all, it was a sartorial miss for the people around me.
But it was my graduation. It was a celebration of all the hard work I put in. It was a time just for me. And that's why I love this outfit. Sometime you just have to go with what you like.
That and purple with navy is a criminally underused colour combo. Ahem