Beachwear trends spring 2012–’Retro‘ is key.
The sexy and elegant one-piece family:
MBMJ’s retro glamour:

Marc by Marc Jacobs Spring 2102 Runway picture from vogue.com
Donna Karan’s gracefully sexy:

Donna Karan Spring 2012 Runway picture from vogue.com
Prada’s floral moment:

Prada Spring 2012 Runway picture from vogue.com
Defining your waist:

Rochas Spring 2012 Runway picture from vogue.com
Miu Miu’s three-in-one: sophisticated, chic, sexy

Miu Miu Bow-Embellished Halter-Neck Swimsuit picture from miumiu.com
JETS’ mesh seduction:

JETS By Jessika Allen Racers Mesh-Panel Swimsuit picture from Net-A-Porter
Zimmermann’s tropical attraction:

Zimmermann Hawaiian Halter-Neck Swimsuit picture from zimmermannwear.com
The off-shoulder sexy:

Violet Lake Caruso One-Shoulder Swimsuit picture from Net-A-Porter
Undrest’s feathery touch:

Undrest Sardinia Woven Swimsuit picture from undrest.com
The fun and refreshing bikinis:
Chanel’s sea goddess:

Chanel Spring 2012 Runway picture from vogue.com
Back to the ’50s:

Dolce and Gabbana Spring 2012 Runway picture from vogue.com
Melissa Odabash’s fun and sexy:

Melissa Odabash Nantes Printed Bikini picture from odabash.com
A classic pucci style:

Emilio Pucci Printed Bikini picture from emiliopucci.com
Mara Hoffman’s tribal inspiration:

Mara Hoffman Embroidered Bandeau Bikini picture from marahoffman.com
Missoni’s ruffle revolution:

Missoni Spring 2012 Runway picture from vogue.com