une jupe beige-claire
a green skirt is "une jupe verte" in French.
jube
The word for 'skirt' in French is "jupe." It is a feminine noun, so you would say "la jupe" to refer to "the skirt." If you need to refer to skirts in plural, you would say "les jupes."
j'ai des cheveux châtains clairs
elle a des cheveux châtains (meaning of a light brown colour, but used only when speaking of hair)
The words you want are Brun or Marron
j'ai les cheveux bruns (or 'châtains' for light brown)
Cette jupe est en coton
To say "light" as in a light color in French, you can use the word "clair."
brun rouille
vous avez les cheveux châtains / les cheveux bruns clairs
Alright, well since i am using an American keyboard its les cheveux bruns clairs