beach shirt       
noun [ C ] US uk/ˈbiːtʃ ˌʃɜːt/ us/ˈbiːtʃ ˌʃɝːt/ (UK resort shirt)
 沙滩恤
an informal style of shirt with short sleeves and a collar, and often a colourful pattern
  He wore slacks and a casual beach shirt. 他穿着休闲裤和沙滩恤便装。 
 They noticed the man was in shorts and beach shirt, despite the cold.
 Compare: Hawaiian shirt
 - More examples
 - Outside of the office, he's comfortable in casual linen and a beach shirt.
 - All I pack is two beach shirts that I have taken on vacation for the past 10 years and a pair of flip-flops.
 - Two young guys in beach shirts and flip-flops drove by in a golf cart.