Could you also have 'sko' in the plural here, like you would in English?
In Danish the plural of 'sko' is 'sko', i.e. there is no difference between singular and plural. So in this sentence 'sko' is in plural.
Could you also say "jeg har ikke på mig sko"?
What about "Jeg har ingen sko på"?
That would work, too.
Hero on socks ftw!