This may sound silly....but my birkins won't batwing. Not that I want them all to. Just one would do. I imagine it's how often you use it and how much you stuff it??? Any thoughts? I have a variety of leathers...which are more prone?
^^ It is when the side leather panels stick out making the bag wider than when they are tucked in. In some leathers as mentioned above this happens even when the bag is not packed full of things. Clemence and Swift are naturals for this and TOGO can go either way. I have a Togo Birkin from 2005 that is stiff as the day I bought her, no batwings and no slouch. Here is a photo of "batwings":
My bag is Clemence and it is pretty stiff,in my opinion. I am not careful and it gets flown around in my car. I purchased it in an Hermes store,and I am trying to relate to all the Clemence experts;but mine is not too slouchy?
I do keep my straps closed and locked because I prefer that look.
The photo in my avatar is with the straps open and floopy.