A bit of contiboard shelving etc should provide adequate material.
If your contiboard is 3/4" thick, then drill and screw through the side of the wardrobe from the inside, into the edge of the filler board. As it is very narrow it won't need any support on the wall side - but you could fix a batten to the wall if particularly worried about it being pushed back. (no need to fix to that batten since it is difficult to pull on a flat surface!)
Look in the Ikea "casualty" area, eBay, facebook marketplace, etcetera for a matching panel or wardrobe. Alternatively, use MR MDF or plasterboard and paint it the same colour as the wall.
Or move the wardrobe closer to the wall :-)
Only if they have skid marks, so that they stick more easily
With some very narrow bookshelves?
#Paul
If it's an outside wall with less than current insulation standards, you will end up with condensation and mildew in the gap, because it's likely to be below the dew point much of the time, particularly as wardrobes with clothes are quite thermally insulating themselves.
In that case, you should consider filling with thermal insulation, ideally sealed to the wall so there's no air circulation between the room and the wall. Same considerations at the back of a wardrobe against an outside wall.
Andrew
That would prevent the door opening fully as it would be impeded by a radiator and the internal drawers would not open.
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