I claim the ornamental design for a fashion handbag, as shown and described.
FIG. 1 is front view of the handbag.
FIG. 2 is rear view of the handbag.
FIG. 3 is a right side view of the handbag.
FIG. 4 is a top view of the handbag; and,
FIG. 5 is a bottom view of the handbag.
The broken lines showing a carrier handle, closure and attachments are for the purpose of illustrating environment and forms no part of the claimed design.