Wearing informal, relaxed clothing rather than formal attire.
“The young man is casually dressed in jeans and a t-shirt.”
“Most of the people at the beach are casually dressed in shorts and sandals.”
Use this to describe people's clothing in Task 3, which adds useful visual detail to your description. Contrasting it with 'well-dressed' people in the same picture shows range and attention to detail.
Synonyms: informally dressed, dressed casually, in casual clothes