I also have Ivar 50er, which is just right for clothes on hangers. In the fabric Ikea boxes, items are folded: small T-shirts and other handy things.
In my experience, in front of a long wardrobe there should be at least 90 cm of aisle. If you have a lot of clothes, you often have to step back a bit to get an overview. Common wardrobes are 60 cm deep. Then there is the door depth; sliding doors add depth. Swing doors take up space in the aisle again and are not recommended. Pax without doors can also be nice without doors. You should consider that wardrobes cannot stand directly in front of a wall. With solid walls, there is a risk of mold formation. At 2.40 meters, you are well within the dressing room width. In my opinion, your child's room is also wide enough, so don't worry about that. However, in the upper floor layout, the bedroom and bathroom areas need to be optimized. Quite a few changes would need to be made to compensate for these shortcomings.