Different chevre leather also makes a difference. I find de Coromandel the stiffest and Mangalore the softest, so the latter puddles. The newer Mysore appears thinner, although it won't puddle like Mangalore it would likely softens and slouches a little in the bigger sizes.
Chevre is my favorite of non- exotic leathers, although I personally count it in "semi-exotics" bc. of its sheen and luxe quality. I LOVE all my chevre bags, Coromandel is the thickest of them and does puddle a bit, but I don't mind. Mangalore is the softest, it too puddles/ creases a bit but so do my Birkins in the size of 35 (except the ones made of Fjord and Vache Liegee).
My opinion is- considering the quality of today's Togo (much thinner than it used to be), Chevre bags don't slouch much at all comparing to Togo, CT or Swift.
This skin is also very rare in handbags these days, I believe it is only available for SOs. If you have any chance to grab one, go ahead!
Slouching is when the bag falls over. Puddling is at the base of the bag. Like at the bottom of a curtain but not so extreme. Your chèvre won't fall over but as time passes, t will not stand as tall but not fall over.