Nouns ending in -aille are usually feminine.
Is taille masculine or feminine?
lataille
The rule behind it
95.8% of -aille nouns are feminine
In context
Ces chaussures sont plus grandes d'une taille.
This pair of shoes is a size larger.
Ce n'est pas la taille qui compte.
Size does not matter.
C'est impressionnant la taille de sa tête.
It's astonishing, the size of his head.