Do you use a holster already?
Are you looking to conceal carry, open carry, or just carry?
With leather I'd wear an undershirt. It's another sweat barrier, and especially new leather holsters tend to leach dye.
With a kydex holster I'd wear an undershirt. It's another sweat barrier and especially plastic can be cold right after being put on, or stick to you after being on a while.
I don't want to flood you here but I'm on this side of the pond and more familiar with what's popular over here, which may or may not help you over there.
If you like the hybrid style with a leather back, and kydex partial cover, I'd guess the most well known maker of that holster style is
Crossbreed
That's not a recommendation for one, or a knock on the other. I have no experience with either. Just more food for thought that Crossbreed is more well known than the Holsterstore, especially for that design.
The first company I linked, Galco is a mass producer not a mom and pop type with an internet storefront. They're McDonalds not Joe's Hamburger Hamlet - Not knowing a whole lot about export regulations, it's possible you may be able to get a Galco holster local to you that you can hold in your hands before you buy- in which case the model you probably want is called a KingTuk
If all Else fails, you can search YouTube and learn how to make your own. I've seen a number of videos, and webpages about how to make your own kydex holster.
Edit: In fact the first link I clicked on a websearch turned up
this how to guide on exactly the holster type you're looking for.