Scuba knit (also called Techno Scuba) and Liverpool are medium weight poly/spandex blend knits available in a wide range of solids and prints.
Scuba knit is a lofty double knit with about 25-40% crosswise stretch, and 20-30% lengthwise stretch. Due to the poly being finely spun, the fabric surface is very smooth with a hint of sheen.
Liverpool is also a lofty double knit fabric with similar fiber content and stretch as scuba. However the surface of the fabric has a crepe-like texture.
I like both of the these fabrics for bra-making because they have a low stretch, which helps create some support. The thickness is appealing if nipple show-through is a concern. The smooth surface of scuba makes it comfortable to wear under clothing. If you like to make bras and bralettes with printed fabrics, scuba and liverpool are great choices
Due to the low stretch percentage, scuba and liverpool bralettes without a back closure could be difficult to pull over the head.
Polyester does not breathe well, so these fabrics could become uncomfortable in a hot and/or humid environment.
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