copycat
/ˈkɒpɪkæt/Definitions
1. noun
A person who imitates the actions, behavior, or style of another, often in an unoriginal or superficial way.
“She was accused of being a copycat for wearing the same outfit as her favorite celebrity.”
2. verb
To imitate or copy the actions or behavior of another, especially in a way that is unoriginal or superficial.
“The band was accused of copying their style from a rival group.”