Tback

Tback is a term used in various contexts, though it is most commonly encountered in fashion. In fashion usage, "T-back" or "T-back bikini" describes a cut and construction where the back of the garment is held by a single vertical strap forming a T shape with the waistband. This design is typically used in thong-style underwear and bikini bottoms, intended to minimize coverage while maintaining support. Variants include t-back, t-string, or other back-strap configurations, with fabrics ranging from nylon-spandex blends to lace or metallic materials. The term appears in product descriptions and fashion journalism, though individual brands may use different naming conventions.

Beyond apparel, "Tback" may appear as a brand name or model designation unrelated to clothing. In software and debugging contexts, some writers informally abbreviate "traceback" as "tback," but this usage is not standard terminology and is not used in formal documentation.

Etymology derives from the back strap configuration resembling the letter T. The term is most recognizable in consumer fashion circles; in other domains, the usage is ambiguous and often replaced by more precise descriptors or acronyms.