I'm with Suz, I have always adapted to what I had. I bought my current closet when I moved into my flat and I could think about what I wanted to a degree, but I had very exact dimensions I had to keep because there was only one place where the closet could go without taking up too much space. That said, I don't think I would want something much bigger in the future, it helps to keep the wardrobe small (and at the moment I also store bed linen and towels in there). But I would want a deeper one with more hanging space. So maybe go to 1,5m width instead of 1m and add a decent clothes rail. And at the moment I have the highest version IKEA has on offer to make the most of the room I have, but it's not really practical because I can't reach the top without a chair. I don't have my shoes in there either, I always have the ones that are temperature appropriate next to the door and the others stored in boxes in a different place. I also don't have bags and jewelry in it. I think you should think carefully what you want to put in there and what you think would be practical for you before you start planning.
ETA
Just saw your comment. I have my belts loosely rolled in a box in the wardrobe, but I'm sure there are better solutions. I have my two or three most used bags on a hook in a corner of the room, the others are under the bed in a box. As for shoes, I would never want them together with my clothes, maybe I'm strange that way. We always had extra shoe storage in the halway and that's where they belong IMO.
