I please explain when to use ´des’ and ´les. I find this confusing .

Hi Glen, 

It depends on what they are wearing -

Mario wears red dungarees 

The word 'dungarees' is singular in French:

un bleu de travail rouge

or 

une salopette rouge

Luigi wears green clothes

which in French is :

des habits verts

or 

des vêtements verts

the plural 'des' is necessary here.

Hope this helps!

Hi Judy,

This question is a little broad so can you give some specific usage that you find confusing?

Hi Emma, 

I could just say, as is often the case -

"C'est l'exception qui confirm la règle! "

but I think in the case of moustaches , it is something you can shave off so you will use 'des', in the case of hair,  it is what you are born with.

You also say 

Elle a les yeux bleus = She has blue eyes 

But you would also say -

Elle a de très beaux yeux bleus = She has beautiful blue eyes 

Elle a des beaux cheveux = She has beautiful hair

Hope this helps?