A. These boots are too small. Have you got bigger ones?
b. I never wear cotton jackets. I'd prefer a leather one ?
c. I don't want these wide pants. I want tighter ones.
d. I just hate long dresses. Do you have shorter ones?
e. Look at this shirt ! It's cool... and how about this fancy one ?
La règle : one remplace un nom singulier / ones remplace un nom pluriel pour éviter la répétition.