Without question, doll dresses come in just about every size imaginable. But, as you would imagine, the more popular sizes (American dolls like Barbie) are easiest to find. On the other hand, finding the right size dollhouse dresses and accessories for miniature dolls is more of a challenge.
You may be surprised that dolls come in sizes beginning at 6 inches and run incrementally by inch all the way up to 36 inches. Even these sizes vary due to the kind of doll. For example, if an adult doll is 6 inches tall then the corresponding child doll is between 3 and 4 inches and a teen doll 4 to 5 inches. Certainly doll clothing and pattern manufacturers are very much aware of these differences. However, the public is less aware. Many people search for doll clothing with the idea that there are only a couple of sizes of dolls when in reality, there are many.
Understanding the scale sizes for dolls will help you to more easily launch your search. The most common doll size is about 11 inches. However, within the category of miniatures there are several different sizes.