Like other adjectives in Spanish, color words follow and agree with the nouns they modify.
Observe:

los pantalones azules
la camiseta amarilla
la blusa roja
el vestido negro
la chaqueta anaranjada

singular   orange arrow   pluralsingular orange arrow   pluralsingular  orange arrow  plural
marron   orange arrow  marronesverde  orange arrow  verdesmorado/a  orange arrow  morados/as
negro/a   orange arrow   negros/asanaranjado    orange arrow  anaranjadosrojo/a   orange arrow   rojos/as
amarillo/a  orange arrow   amarillos/asblanco/a    orange arrow   blancos/asazul    orange arrow   azules


Don't forget that nouns have gender in Spanish.
They can also be singular or plural depending if the words they modify are singular or plural.
Here's a chart to help you:
             singular     arrow     plural  
Masculine             el (the)            arrow      los (the)
   Feminine             la  (the)              arrow    las (the)

 
Now try these:
the green shoes  _________________________________________
the brown pants  _________________________________________
the purple dress  _________________________________________
the black skirt  __________________________________________
the white socks  _________________________________________
 the yellow suit  __________________________________________
the blue jacket  __________________________________________

Try them in Spanish to English:
los zapatos marrones _______________________________________
los calcetines azules ________________________________________
la camisa anaranjado  _______________________________________
los pantalones negros  _______________________________________
el traje blanco  ____________________________________________

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