These suspenders (or as the Brits call them, braces) are by Wrath Arcane. It's like someone from the Mad Max Thunderdome future shipped them to us in a time machine.
However, the styling of this model's clothing does nothing to compliment the suspenders. But these braces could be quite nice with the right articles of clothing. Anything from Johannes Faktotum or Robert Geller would do them better justice.