What is the reason for placing a separate snap button at the bottom of the cardigan's front panel?

When looking at the garment, what catches the eye first are the front panel and the sleeves. This cardigan incorporates decorative elements by attaching metal buttons to the front closure and sleeve ends^[1].

On the other hand, at the bottom where the hem ends, a snap button is attached without exposing the button on the outside^[2]. Snaps, commonly called press studs, consist of interlocking male and female parts that fasten together, making it a closure method that keeps the exterior surface smooth and neat.

Placing a snap button at the hem reduces the feeling of button decorations overlapping excessively and allows the silhouette to stay clean. Because it can be lightly detached or fastened by hand, it is also useful for wearing with just the bottom slightly opened so the hem does not pull tight when sitting on a chair or walking.