skinny pants
'Pantalón pitillo' is a Spanish term that represents a specific type of trousers. In English, it is often referred to as 'skinny jeans' or simply 'skinny pants'. These are a type of trousers that are tight-fitted through the waist, hips, and legs, down to the ankle. They became popular during the late 2000s and early 2010s. The term 'pantalón pitillo' directly translates to 'trotter pants' in English, but the understood meaning is 'skinny pants'.
I need to buy a new skinny trouser.
This sentence is expressing a need (necesito) to buy a new skinny trouser (un nuevo pantalón pitillo), likely for personal use.
My favorite skinny trouser has worn out from use.
This sentence is conveying the speaker's sentiment about their favorite pair of skinny trousers (Mi pantalón pitillo favorito) that has worn out (se ha desgastado) due to usage (por el uso).
She is wearing a red skinny trouser.
This sentence is describing what a woman is wearing (Ella viste), specifically a red pair of skinny trousers (un pantalón pitillo rojo).