Due to the fact that our garments are made to order, we ask that you review our size charts and measure your dog to determine the perfect size before placing your order (please refer to "Size Chart" and the "How To Measure" pictures above). Please note, if you are stuck between sizes, it’s always better to go up a size than go down a size! Thanks for respecting the process, we can't wait to make your perfect Honest Dog Co apparel piece! HONEST DOG APPAREL IS MADE WITH THE FOLLOWING - Dress: soft, stretchy 65% Cotton & 35% Polyester (our fabric is soft and both breathable as well as sweat-resistant. Polyester also reduces wrinkles and doesn't shrink as much as cotton in the dryer). Thanks for shopping with us! We look forward to outfitting your fav fur-person!