We each have to know our height (petite, regular, or tall), shape (apple pear, etc.), skin undertones (warm or cool) - and that might not be enough. You may be short waisted or long waisted. If you've been doing all your homework, but still struggle with fit, your waist may be longer or shorter than average. Or maybe you know that you're short waisted, but you're not sure how that should affect your wardrobe.