A dermaplastic garment was an article of clothing designed by The Doctor for Seven of Nine in 2374.
Attempting to "balance functionality and aesthetics", The Doctor provided Seven with this garment after removing many of her Borg implants, in an attempt to assist her transition to a member of the USS Voyager's crew. (VOY: "The Gift")
A year later, The Doctor revealed to Seven that, when he first designed Seven's dermaplastic garment, which was very functional, he also tried his hand at casual attire, and suggested she replicate one in preparation for an upcoming date. (VOY: "Someone to Watch Over Me")
Seven's brown (no collar) garment was first introduced in "The Raven". Her brown (high collar) garment was introduced in "Scientific Method". Her two-tone blue garment was first introduced in "In the Flesh".