It is a late 50s/early 60s dress from a Spanish designer in perfect condition and has pockets!
Ah, the 50s! Fabulous days in the sun, huh? Back when people didn’t have smartphones and electronic devices, beach days were filled with photographers, sufers and young couples often accompanied by friends (at least in Spain, where unmarried couples were often watched over to ensure they wouldn’t do inappropiate things).
In the mid 40s a new type of swimwear came out: shorter swimsuits and two pieced suits would soon hit the beaches, especially in the 50s. Women would no longer be afraid of showing off their bodies, and the popularity of the two pieced bathing suit (which later on would evolve into the bikini) encouraged more women to go to the beach to get a tan.