Kate Middleton owns a pair of brown suede boots from Gianvito Rossi. They feature a large block heel, pointed toe and side zipper.
Kate Middleton debuted the brown boots at the England v Papua New Guinea rugby match in November 2022 (pictured below). She wore them for a second time, in public, during a visit to Boston in December 2022 (pictured above).
Gianvito Rossi have confirmed they made the boots for the Princess. As far as I understand, they’re bespoke—a custom creation.
Gianvito Rossi currently sell lots of similar pairs of boots, as you can see:
From left to right: Gianvito Rossi Heeled Suede Boots at FarFetch; Gianvito Rossi Suede Knee high Boots With Pointed Toe at MyTheresa; Gianvito Rossi Calf-Length Boots with 60mm heel at FarFetch; Gianvito Rossi Glen Boots at 245.
Kate’s boots are most like the ‘Glen’ style in Texas brown, shown on the right. They just feature a pointed toe instead of a rounded toe.