Celeris is a Portuguese brand, I have a lot of boots and shoes from them and I love it, not very expensive wich is a good point!
I have the tuffrider Belmont dress boots. They look like parlantis but they are not close to the price
Sergio Grasso or if you are doing jumpers, FreeJump has a couple models of tall boots as well as leather half chaps/paddock boots that look like tall boots.
If you don't want to spent a lot of money, go for the synthetic leather. There is BARELY any difference in the look and feel and they are super durable
I have mark todd ones and aiat ones. for competition use Tuffers boots.
Deniros fit like a charm and are durable
Parlanti if you don't mind spending $$$. They hold up really well and fit to your leg awesome. Ariat for a slightly cheaper option. They also hold up pretty nicely
I really like tredstep bc they have multiple styles so you can pick which one works for you.