 Can you wear a blazer with jeans? Yes, you can. But there are some things you need to know in order to do it right. First thing is that the color of your jeans doesn't matter. Dark jeans, light jeans, black jeans, white jeans. They all work. What does matter is that you wear the right jacket because not every jacket works with jeans. Denim has a certain weight to it. It has a bit of texture. And jeans are just more casual in general so your jacket has to match. What this means is no jackets that have a sheen to the fabric. This is a huge mistake that guys make. Instead, choose a fabric that's hardier like flannel or tweed or one that has a texture like linen or hopsack. I'm also gonna recommend that you don't wear a tie. Kind of looks out of place in my opinion but completely your choice. And I'm just here trying to make sure you look and feel your best.