This amazing crossed-top halter style piece is a wonderful addition to your wardrobe. The bust is slightly adjustable as it's a halter style that ties behind the neck. The back is a semi-stretch super soft material that will allow for a little wiggle room in sizing as well. The main sizing depends on the waist. Pair this with one of our light up skirts or mini skirts and you'll have the most dazzling outfit you've ever laid eyes on! Fabric: The Fiber optic fabric is White when unlit, and changes colors based on user input. The fabric is a synthetic blend that has many fiber optic nodes running through it in order to illuminate. It's slightly stiffer than normal cotton blend fabrics, but is still very comfortable to wear. USB Rechargeable Battery and Controller: Our fiber optic clothing all come with a wireless remote control, Rechargeable USB control block, and a USB cable for recharging. The battery can be plugged into a phone charger, laptop port, or car charger. Color Selection: The controller allows you to switch between Red, Green, Blue, or White, and also lets you switch between Flashing, Strobe, Fade, or Smooth transition. You can always keep the lights set to a specific color as well. Sizing/exchanges: Buying clothing online can be an intimidating option. We do our best to explain the sizing and options you have, but sometimes you just have to try something on. For this reason we offer exchanges on all items. If you don't get the right size please contact us within one week of receiving your item so we can arrange an exchange. Give the sizing chart a look before purchasing! One Year Limited Warranty: All of our Fiber Optic Clothing and Accessories come with a one year limited warranty. All electronic components are covered for manufacturer defect (This does not apply to damage done by the customer). Please contact us and provide us your order number, name and date you placed your order to initiate a warranty claim. We will then exchange your defective item with a replacement item. Time to Ship: We're building a heavy supply of these, however not all sizes are always in demand and as such it could take up to 3 weeks to receive your fiber optic attire. Feel free to drop us a message and we'll let you know if we have yours already made!