Gentle Readers, Isabel G sent this link to a PDF document that provides explicit instructions for creating a pineapple-shaped reticule. The image on the right is of a costume at the Kyoto Costume Institute in which the mannequin is holding a regency era pineapple reticule, and the image on the left is of a similar reticule that you can make.
If I might add only one critique: I'd choose the softer pineapple yellow of the Regency era than the more garish banana yellow in the image depicted at left.
Posts about reticules on Jane Austen's World