So I know your supposed to have a somewhat hourglass silhouette when wearing a blazer or sport coat, as in it should come into the sides a bit. But what about other coats and jackets? Is this the ideal shape for outerwear? I have a military-style zip rain jacket and it definitely gives me an hourglass shape (not skin-tight but noticeable) and I'm wondering whether or not I need to get it tailored.