The singer-songwriter, who is nominated for four prizes, told the Sun he's abandoning his trademark hoodie and wearing a suit.
He said: "I'm not the kind of person who would turn up in a limo or be bling-tastic.
"I'm only wearing a designer suit to the awards because my mum and dad are going and they will want me to look nice."
And it seems his parents are making a similar effort for the ceremony.
He said: "My parents are excited. They've not been drinking so they can slim down into their desired clothes."