A one-piece garment is a garment that forms a complete outfit in one piece. One-piece garments may be worn as lingerie or as outerwear. Some one-piece garments are skin-tight garments, others are loose garments. Many of the older ones are draped garments.

Examples include:

Loose one-piece garments:

• boiler suit
• dress
• flight suit
• jumpsuit
• loincloth
• coverall
• one-piece pyjamas (the vast majority of pyjamas are two-piece)
• romper suit (for babies)
• sari
• sarong
• ski suit
• snowmobile suit
• toga

Make-shift one-piece garment used when going to and coming from the shower, etc.

• Bath robe
• dressing-gown
• towel

Skin-tight one-piece garments:

• catsuit
• diveskin
• leotard
• one-piece swimsuit
• unitard
• wetsuit
• bodysuit