This is the 10299th most frequent Spanish word.
completos
"Completos" means "complete" or "finished" in English.
The word 'completos' is used here as an adjective describing the state of the plans, indicating they are finished or have all the necessary parts.
Los planes están completos.
The plans are complete.
Here, 'completos' qualifies 'trajes de baño' (swimsuits), indicating they cover the whole body instead of being two-piece swimsuits.
Los trajes de baño completos son ideales para nadar.
Full swimsuits are ideal for swimming.
In this sentence, 'completos' is used as an adjective indicating that all necessary requirements are fulfilled.