So? What exactly is a ShapeShifterZ garment? Athleisure? Sportswear? Activewear? A costume?
We say, "Yes. Exactly." Sometimes we refer to them as Costume Sportswear. What would you call them?
From Wikipedia, the free encyclopedia here are some definitions
Athleisure is a trend in fashion in which clothing designed for workouts and other athletic activities is worn in other settings, such as during work, casual or social occasions.   Athleisure outfits are yoga pants, tights and leggings  that "look like athletic wear" and are characterized as "fashionable, dressed up sweats and exercise clothing".   The idea is that gym clothes are supposedly making their way out of the gym and becoming a larger part of people's everyday wardrobes.  By some accounts, the athleisure trend grew out of women wearing yoga pants.  Another account suggests that the trend came about because people could wear them for multiple occasions without having to change, which meant greater convenience, since people did not have to carry an extra gym outfit on the way to the office, for example. 
Sportswear or activewear is clothing, including footwear, worn for sport or physical exercise. Sport-specific clothing is worn for most sports and physical exercise, for practical, comfort or safety reasons.
Typical sport-specific garments include shorts, tracksuits, T-shirts, tennis shirts and polo shirts. Specialized garments include swimsuits (for swimming), wet suits(for diving or surfing), ski suits (for skiing) and leotards (for gymnastics). Sports footwear include trainers. It also includes some underwear, such as the jockstrap and sports bra. Sportswear is also at times worn as casual fashion clothing.
For most sports the athletes wear a combination of different items of clothing, e.g. sport shoes, pants and shirts. In some sports, protective gear may need to be worn, such as helmets or American football body armour.
Costume is the distinctive style of dress of an individual or group that reflects their class, gender, profession, ethnicity, nationality, activity or epoch.
The term also was traditionally used to describe typical appropriate clothing for certain activities, such as riding costume, swimming costume, dance costume, and evening costume. Appropriate and acceptable costume is subject to changes in fashion and local cultural norms. 
"But sable is worn more in carriages, lined with real lace over ivory satin, and worn over some smart costume suitable for an afternoon reception." A Woman's Letter from London (23 November 1899). 
This general usage has gradually been replaced by the terms "dress", "attire" or "wear" and usage of "costume" has become more limited to unusual or out-of-date clothing and to attire intended to evoke a change in identity, such as theatrical, Halloween, and mascot costumes.
Before the advent of ready-to-wear apparel, clothing was made by hand. When made for commercial sale it was made, as late as the beginning of the 20th century, by "costumiers", often women who ran businesses that met the demand for complicated or intimate female costume, including millinery and corsetry. 
Alex Bellemarre in a custom ShapeShifterZ. A young Canadian athlete to keep an eye on.
Model Hila @bonafidesavage Photo by @yNotDigital