As the swimsuit was evolving, the underwear started to change. Between 1900 and 1940, swimsuit lengths followed the changes in underwear designs.[225] In the 1920s women started discarding the corset, while the Cadole company of Paris started developing something they called the "breast girdle".[226] During the Great Depression, panties and bras became softly constructed and were made of various elasticized yarns making underwear fit like a second skin. By 1930s underwear styles for both women and men were influenced by the new brief models of swimwear from Europe. Although the waistband was still above the navel, the leg openings of the panty brief were cut in an arc to rise from the crotch to the hip joint. The brief served as a template for most all variations of panties for the rest of the century.[227] Warner standardized the concept of Cup size in 1935. The first underwire bra was developed in 1938.[226] Beginning in the late thirties skants, a type of skanty men's briefs, were introduced, featuring very high-cut leg openings and a lower rise to the waistband.[227] Howard Hughes designed a push-up bra to be worn by Jane Russell in The Outlaw in 1943, although Russell stated in interviews that she never wore the 'contraption'. In 1950 Maidenform introduced the first official bust enhancing bra.[226]

A snorkel can be useful when scuba diving as it is a safe way of swimming face down at the surface for extended periods to conserve the bottled air supply, or in an emergency situation when there is a problem with either air supply or regulator.[63] Many dives do not require the use of a snorkel at all, and some scuba divers do not consider a snorkel a necessary or even useful piece of equipment, but the usefulness of a snorkel depends on the dive plan and the dive site. If there is no requirement to swim face down and see what is happening underwater, then a snorkel is not useful. If it is necessary to swim over heavy seaweed which can entangle the pillar valve and regulator if the diver swims face upward to get to and from the dive site, then a snorkel is useful to save breathing gas.
Attached to the demand end of the snorkel at the bottom of the barrel, the mouthpiece serves to keep the snorkel in the mouth. It is made of soft and flexible material, typically natural rubber and latterly silicone or PVC. The commonest of the multiple designs available[51] features a slightly concave flange with two lugs to be gripped between the teeth (see Figure 9):
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