Shawn Mendes' ''number one style rule'' is to ''try everything''.
The 20-year-old singer thinks the most important thing to do when deciding your look is to step outside of your comfort zone, and to stick to your fashion instincts even when others are unsure.
In an interview with GQ, he said: ''My number one style rule would be to try everything. I remember when I went to put a necklace and rings on for the first time and everyone was like 'I don't know man', but if you genuinely feel like it's cool then you should wear it because then it will be cool.''
Although the 'There's Nothing Holdin' Me Back' hitmaker has become known for his signature style of jeans, t-shirts, Chelsea boots, and statement jackets, he admits that it took some time for him to find the right look, and that his fashion choices have changed over time.
He said: ''I went through a stage of wearing black khaki trousers, a black shirt, white socks, and black shoes.
''I wore this look everywhere. I've really changed the way I dress. I had to do a shoot in New York once and I put on a leather jacket as a joke, but it turned out alright.''
The 'Stitches' singer's all-time favourite look was during his performance of 'In My Blood' at Queen Elizabeth's star-studded 92nd birthday bash in April this year.
Shawn said: ''I love the suit I wore for the Queen's birthday. It was a red Kooples suit and it made me look more tanned on TV, which is always a good thing.
''I get a lot of say in what I wear. My stylist and I are extremely close and we have been working together for four or five years now.
''If you look at pictures, during that time we have changed my overall look three times. A highlight for me regarding fashion is that I've become more adventurous.''