You have to look in the mirror and see that what you're wearing looks good on the body you have now. Wearing a larger size is just... wearing a larger size.
Fashion is an industry to make money. It plays into human psychology. We want to belong, we want to be loved. I'm not trying to demonize the fashion industry - I love the fashion industry - but style is about taking the control out of the industry's hand and having you decide what works for you.
Don't let fear or insecurity stop you from trying new things. Believe in yourself. Do what you love. And most importantly, be kind to others, even if you don't like them.
Never let a trend get in the way of creating a great outfit for yourself.