WHERE YOUR CORRECT SIZE IT WILL SHOW POSTURE KEEP YOU IN CHECK ON WAIST AND FEEL BUT I STILL WEAR OVERSIZED TO KEEP FROM OVER HEATING IT'S WHY CHEF HAT ARE LONG GIVES AIR CIRCULATION I SLOUCH WEAK BACK BUT ANY INJURY CAUSES OVER COMP,AND OTHER ISSUES SO IT CAUSED ME LORDOSIS* AND I STILL DO PHYSICAL THERAPY TO CORRECT IT,SO HERE THE BASIC YOU LIFT HEAVY AND ARCH BACK IT TAKE DISCIPLINE NOT DO YOU HAVE TO DO LORDOSIS EXERCISES ALWAYS TO PREVENT IT. THEY PUT A VERY DISTINCTIVE MUSCLE ON HIPS AS WELL THERE MANY THAT'S HOMEWORK * LORDOSIS AND P.T