Ils ? O.o
Probably just mixing things up again, but...
Would "ils sont des jupes" sound the same? Is that grammatically correct for "they are skirts"?
You can say “Ce sont des vêtements et ils sont des jupes.” but “ils sont” is pronounced [il'sɔ̃] while “ils ont” is pronounced [il'zɔ̃] (with a voiced “z” as in English “zebra”).
And why not?
Are they Scottish?