I wear a size 16 x 34 shirt and have to get them tailored because they are always too baggy and I am rather skinny. I am exactly 6 feet tall. I measured my chest and it is 38.5 inches. I also prefer my garments to fit snugger rather than loose. On a shirt that fits me well in the shoulders, the distance between the two seams is 18 inches. What size jacket would I wear, and what chest size should I look for in a jacket when measuring it?