I have the tall Pax wardrobes in all three kids bedrooms ( they are teenagers and have a lot of stuff ). We have a combination of white gloss doors and mirror doors. If you want a more traditional look , Ikea sell white panelled doors.
If I had your space I would have 2 x 50cm . One side with 2 or 3 baskets at the bottom, to take clothes that you would put in a chest of drawers - underwear , PJ, shorts, tops, etc. Two might be enough because they are very deep. It depends if he prefers to hang or fold things like T shirts.
Then shelves above for sports kit. He can put ‘out of season’ kit on the top One or two shelves because he won’t be able to reach them without a small ladder.
Skiwear is best in a zip up bag so it can be compressed.
Other side of the wardrobe would be two hanging rails, one above the other ( as he won’t have any long items). And one shelf high up to make the best use of space . Again you can put out of season clothes on this.
There are lots of fancy fittings for the Pax wardrobes but most kids won’t use them. Eg they will toss all their shoes in a heap on the floor of the wardrobe and ignore the shoe rack.
The drawers (and some of the other fittings ) for the Pax are very expensive and kids prefer the wire baskets as they can see what’s in there. They also allow more ventilation - always handy for sports stuff.
So I’d go for the basic fittings. And remember if you buy too many shelves etc you can return them as as long as you don’t unwrap them.
You won’t have 15cm wasted on each side of the wardrobe because an old house will have deep skirtings that hold the unit out from the wall. It will end up getting sports bags dumped there anyway.