Suede is almost a contradiction when it comes to shoes.
Yes, it used to be that suede was only worn in colder months. I imagine it's due to the texture of suede, making it seem almost "fuzzy," in which that kind of texture could make someone feel warmer.
For sandals or even closed shoes, however, if you think about the weather, there is more opportunity for drier weather in warmer months (at least in some areas) and therefore suede might be less likely to become spotted or otherwise damaged by rain. And that might be a good argument for wearing suede sandals in spring/summer. Especially since suede is leather, and we already wear leather shoes or sandals in all seasons.
None of this applies to garments meant to keep you warm, like coats or jackets.
Handbags are "up for grabs." [pun intended]
[was Homegirl] Love to be home . . . thus the screen name. Joined 2003.