I claim the ornamental design for a wetsuit bottom, as shown and described.
FIG. 1 is a left perspective view of a wetsuit bottom, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left perspective view of a wetsuit bottom; and,
FIG. 4 is a front view thereof.
The regular dot-dot-dash lines are included for the purpose of illustrating portions of the wetsuit bottom that form no part of the claimed design. The bold dot-dot-dash lines represent boundaries of the claimed design. The broken lines within the bold dot-dot-dash boundary represents claimed subject matter.