Libras need not bare all, even a lot, to look sexy...Your gentle sign is ruled by Venus, the planet of beauty and love. That explains your grace, smooth talk and pretty face. It also explains your elegance and sense of style.
You know how to make an entrance, but you would never do it in an unrefined way. Your sign's not conservative per se, but you like to keep it classy. So you're not likely to be found in a super short skirt or plunging neckline. Sweet and romantic are really more you.
If you want to take a style risk, try showing a little more skin in your trademark, tasteful way. Since Libra rules the lower back, trying a slightly lower rise pant, or a dress with a cutout in this area can provide a little sexiness and still leave them guessing. Your reputation, so important to your sign, will also stay intact.