Floor plan planning shortly before submitting the building application

If I see it correctly, there is a bit more than 1m of space between two 60cm deep cabinets. Something around 116 or 117cm. That is still okay for a closet space - whether it is appropriate for the luxury villa - well.

Maybe just a sideboard at the front?

okay, I don’t iron (I’m somehow too incapable of it). and my husband irons his few shirts and pants himself that need to be ironed and they then of course hang with us (and my clothes). currently have 1.5 meters of wardrobe and 2.4m dresser

I would probably take 2x 50 cm deep cabinets,

And then hang suits in there at an angle?

so you can hang things on hangers either in front of each other or behind each other, for that there is e.g. at Ikea for the Pax the komplement clothes rail for the shallow cabinets. my parents-in-law also hang the jackets in their vestibule, which is quite small, in front of each other (and the closet is not from Ikea, so it is also available from other manufacturers)

And then hang suits in diagonally?

If you have such broad shoulders. 50 cm depth is not so nice for stuffing in, but quite common.

Folding it together creates the creases.

Only if you stack them on top of each other, not if you stand them upright. But whatever. At least one dresser as a storage surface would also make a lot of sense to me. Or a kind of makeup dresser with a larger mirror, unless that is already planned somewhere else.