The Skant Uniforms and Kilt Uniform were available as a timed giveaway. The Starfleet scant (infobox image) is designed as it appeared on some male crew on Star Trek: The Next Generation and comes with a matching top. The Klingon and Romulan variants (see gallery below) are simply the lower piece. The Kilt is based on Montgomery Scott's dress outfit from Star Trek: The Original Series. All skants are available for female as well as male characters.
The parts were given away TNG's 30th Anniversary (22nd Sep. 2017 - 3rd Oct. 2017).