Measure the hair length correctly
The real hair length is always the stretched length. While straight hair is always true length, wavy or curly hair is not. You can order your curly or wavy hair 1 or 2 sizes longer to get the length you want
In the picture below you can see all available styles. The picture shows bundles in 24" 60cm. You can very well see that some styles look much shorter than others. The straight hair shows the real 24" 60cm