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1. A negative pressure wound therapy dressing comprising a dressing body and a drainage tube, wherein the drainage tube comprises a tube knitted or braided from a monofilament yarn and having a length, wherein an impermeable sheath including two separate sheets of an impermeable material sealed to one another along the length of the knitted or braided tube surrounds the knitted or braided tube such that the knitted or braided tube is sandwiched between the two separate sheets of the impermeable material, wherein the two sheets of the impermeable material are sealed to one another along the length of the knitted or braided tube without another layer being interposed between the knitted or braided tube and each of the two sheets of the impermeable material along a vertical plane passing through a center of the knitted or braided tube, wherein one end of the drainage tube has a tab integrally formed with the two sheets of impermeable material by which the drainage tube may be attached to the dressing body, wherein the knitted or braided tube extends along the length thereof from a first end to a second end arranged opposite the first end such that the knitted or braided tube has a constant diameter relative to an axis passing through the center of the knitted or braided tube, wherein a diameter of the tab is greater than the diameter of the knitted or braided tube, wherein the knitted or braided tube has a first tubular shape and the two sheets of impermeable material define a second tubular shape complementary to the first tubular shape of the knitted or braided tube, and wherein application of negative pressure in use of the negative pressure wound therapy dressing flattens the knitted or braided tube to facilitate conformance of the drainage tube to the skin of a patient.
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