A weighted and hermetically sealed garment supplied with air; worn by underwater divers WordNet 3.0 & Open English WordNet

Standard diving dress, also known as hard-hat or copper hat equipment, deep sea diving suit or heavy gear, is a type of diving suit that was formerly used for all relatively deep underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications. Wikipedia

A diving suit is a garment or device designed to protect a diver from the underwater environment. Wikipedia

The old heavy canvas diving suit with a large metal helmet Wikipedia Disambiguation

Garment or device designed to protect a diver from the underwater environment Wikidata

Rubberised canvas diving suit with copper helmet and weighted boots Wikidata

A garment or apparatus worn by a diver for protection from the underwater environment. Wiktionary

Garment or apparatus worn by a diver for protection from the underwater environment. Wiktionary (translation)