Does wavy hair look thicker than straight hair?

Usually wavier hair would look thicker, but there are other factors that play into how thick hair looks. Waviness is just one factor that can make hair look thick.

Wavy hair! If you have two individuals both with hair density of 80 follicular units per square centimetre- the individual with wavy hair will appear to have thicker hair.

Wavy hair looks thicker than straight hair but curly looks even thicker depending upon the curl. More coarse hair also looks thicker