As for your question, a dress with tights and flat boots can work–you just need to choose your proportions correctly. If you are short waisted (and have long legs in proportion to your torso), then you’re going to be fine with most boot choices. But if you’re long waisted (and have short legs in proportion to your torso), then you’re going to want to make your legs look as long as possible. Here’s how to do this:
(1) Keep the color of the tights and boots in the same color family. This will help to create a long, unbroken line for the eye, which makes you look taller.
(2) As for the height of the boot, a just-below-the-knee boot is nearly universally figure flattering. A ankle boot (or bootie) is also a popular choice this season. The most figure flattering length for ankle boots is just below or just above the ankle–if you choose a boot that ends at the ankle, it makes your ankle and leg look wider than they actually are.

Hope that helps, Gen!

by the way, i’ve just created a new blog and would really appreciate it if you could chekc it out sometime: http://heavens-wardrobe.blogspot.com/ - oh and i’ve linked you as well
xx