If the alterations tailor is good and the salesmen are not- always have the tailor select the coat and pants from the rack. A good tailor wants to do the lest amount of work and the customer has the best fitting garments from that store. The salesmen job is that you part with your money. The scope of fitted clothes is often out of their territory. br> Perhaps, suspenders can be used to pull up the back of the pants. It may not work because of fitting problems. As far as the coat goes it looks like the front is cut to "straight" for your body. A "crooked" cut, or, adaption, would bring the fronts towards the center a little more. If the hemline is not level the neck lines need to be adjusted, front raised and back lowered, or vicea versa. The bottom of the armhole is way to low for that coat. The armholes are way to big by depth. The only waistline of coats are important. If to low the coat doesn function very well. If to high, my opinion, it looks silly. Anyway, events are more important than clothes.