Floor plan city villa 190 m² on slab foundation

Come on now. Especially from someone like you, who placed enormous value on interior design in their own house, I expect a nicer wardrobe than in your office...
Besides, in your example, shoes, hats, gloves, scarves, and a place to put keys are still missing. And the OP also mentioned a seating option.

Regarding the clothes rack or the wall hooks in the utility room, you might be right, but there is still not enough space for that. Unless you almost completely forgo other storage options for it.
The lower wall on the plan is probably almost completely occupied by technical installations including the house connections, the upper niche serves for the washing machine/dryer and all the other stuff needed for laundry. Or vice versa.
Great, then there’s the wall to the WC left. Since there’s no room for a shelf behind the door anyway, you could put the wardrobe there. But that’s about it. Where would the shoes go? On a shelf above the washing machine or what? Then the window would be in the way...

I don’t care, I don’t have to live in it, I just wanted to point out that the planned space for a wardrobe will very quickly reach its spatial limits.
On the other hand, to my taste, available space is being handled too generously. Why not make the upper part including office/wardrobe/WC/utility room a bit bigger, and the open-plan living area a bit smaller?
In the guest WC you can’t even open the door properly without having to stand between the toilet and the sink first. With a raw construction size of 1.60 m less plaster and toilet (if there’s no wall concealed installation) about 1 m remains for you and the door.

This has nothing to do with taste, it’s simply impractical and annoying in the long run.

What the OP makes of it is their business, I’m out here. No offense intended.

Which federal state? A garage with 3m width as border construction could conflict with the required setback areas of 1/2 H (where H is the height of the main building) in some federal states, if it is 8 or 9m high.

[Take a photo.]
Smarty, you see: nothing. The little you can see of the houses in the background at least justifies the assumption that you were reasonably straight when taking the photo. You at least wouldn’t have made us guess that you were probably standing roughly in front of the garage entrance (?)
This is almost as valuable as the half-centimeter-accurate information of parapet heights, unfortunately without the addition of whether it is before or after Christ, with or without VAT ...

don't forget the laundry chute in the bathroom!

the niche by the office is enough to hang more than enough everyday jackets.

Then there are those who care more about design and attach a hanging board to the wall with nice decoration:

This is roughly the plan for the wardrobe niche. Maybe our current hallway provides a good reference:

[IMG alt="506EA387-2A0B-4CBC-AA3B-4DE702B2CB14.jpeg"]https://www.hausbau-forum.de/attachments/506ea387-2a0b-4cbc-aa3b-4de702b2cb14-jpeg.52753/[/IMG]

I would say that we think very, very design-oriented. But functionality must not be completely neglected in the process.

Have you ever seen a T-bathroom live? It may sound practical, but it is one of the modern construction sins.