1-Our most favourite combination - Blue blazer goes very well with any grey shade pant. Any Shade of Blue Blazer matched with a grey pant and you are good to go.
2-Blue Blazer can also be paired with a beige pant.
3-Blue Blazer can also be paired with a White pant.
4-Blue Blazer can also be paired with any lighter blue shade jeans
5-The ultimate Full Set look.
One of the most common mistakes to avoid - never pair a blue blazer with a different blue shade pant. Even the slightest difference is seen in the light and makes it look odd.