They're called "Jeans" in French, too. Note: French pants are a singular entity. Just like a pair of pants is un pantalon, a pair of jeans is un jean. But (s)he asked for what is the french for blue jeans, so it is un jean bleu.
le pantalon
des pantalons rouges
Green in French is vert (which is masculine) or verte (feminine)
Une chaussette is a feminine noun in French.
"loup vert" means "green wolf" in French.
The word "trousers" in French is spelled "pantalon."
"Les trousers" is masculine in French. The word for "trousers" in French is "le pantalon," which is a masculine noun.
Trousers = un pantalon
Green trousers would appear black when exposed to red light because the red light does not contain any green wavelengths to reflect off the trousers. Without any green light to reflect, the trousers will appear black in the presence of red light.
(les) pantalons.
Pantaloons
rd and green
pantalon is a French word. It means 'trousers'.
le pantalon
a pair of trousers
Green trousers appear black when exposed to red light because red light does not contain any wavelengths that are able to be absorbed or reflected by the green dye in the trousers. As a result, the dye appears dark or black.
a traditional outfit for waiters is: black trousers, white shirt and a black (or dark green or dark red) waistcoat.