Love, love, love this dress! I'm 5'5" tall and 124 lbs, and size M fits perfectly. If you're under 5'5", it may be a little too long. I will be wearing a 5" heel. I got in in transparent blue, silver, and black.
We have a lot of zippers on our products here and a lot of options for zippers. A lot of times our patterns come with a pre-set selection, but we can customize more. Locking, WaterTight and even air-tight zippers are sometimes requested as customization features. You can always ask for a quote for something via the "I'd like to customize this product" link on any page. Meanwhile, here's a simple picture to explain the type of zippers and what they are called.