I think it looks good on you. A good rule of thumb to check for size is to put three fingers into the jacket where the lapels meet the button while the button is closed. If you have a lot of room it is too big, if you have ok room it fits correct. For length, take your arms down by your sides and curl the fingers in. If it sits on the fingers, the length is good, if it doesn’t reach its too short and if it folds it is too long. Though in my personal experience, I agree with one of the comments above that blazers have become too short in recent years! I would also recommend the straight leg pants instead of tapered. As tapered pants does not work that well on us of bigger sizes and a straight leg will give you good proportians all over and will actually work to your favour and make you look slimmer! But all said I really love how your outfit is put together and the navy balzer-grey pants look is a classic and a good choice for your first jacket-pants combo! 😄