outershell

plural outershells

1. rareA protective cover or layer (especially referring to an item of clothing).

   Try trimming extra clothing by using layers of polypropylene clothing and waterproof outershells.

   1993, Jeff Bennett, Rafting!: The Complete Guide to Whitewater Rafting Techniques and Equipment, Portland, O.R.: Swiftwater Publishing Company, →ISBN, page 201

   2 more examples

   Some camera bags have an outershell built in for protection against wet weather. If yours doesn't, a large plastic bag is easily carried and will do the job.

   2004, Richard I'Anson, Travel Photography: A Guide to Taking Better Pictures, 2nd edition, Melbourne, Victoria; Oakland, C.A.: Lonely Planet, →ISBN, page 134

   I found myself suddenly self-conscious about my modern gear—my polyester long johns and camp sandals, my Patagonia outershell and wool cap. I felt kind of like a faker.

   2015, Jason Mark, Satellites in the High Country: Searching for the Wild in the Age of Man, Washington, D.C.; Covelo, C.A.; London: Island Press, →ISBN, page 201