or likely to confuse to a distressed victim trying to stay afloat after an inflation event air trapped in the bladder 24 can be purged through a release valve 54 that penetrates the shirt 18 in the upper front shoulder area the release valve 54 may also be used to orally inflate the bladder 24 by means of the user manually blowing into valve 54 the release valve 54 may be concealed by a flap 56 made of elastic fabric that is secured to the swim shirt 18 having a free end which may be folded over to cover the release valve 54 and releasably held in the folded over position such as with hook and loop style fasteners or other waterproof closure devices fig4 5a show an example of the bladder 24 absent the shirt 18 the bladder 24 is manufactured in a flattened state but when folded over and placed within the swim shirt 18 it forms an ergonomically considerate design that compliments the contours of the human body the bladder 24 has a rear panel 30 which in an inflated state creates an air chamber resembling a pillow behind the wearer 39 s head 42 the bladder 24 is formed with two or more layers of material that are sealed around their perimeter to define a sealed gas chamber within the bladder may be sealed in a variety of ways commercially known such as ultrasonic welding radio frequency welding and or an adhesive the continuous design.