Two whites, two different jobs
The white at the neck, at both armholes and around the back opening is binding: a strip folded over a raw edge and stitched down so it cannot curl. The white down the outside of each leg is not that. It is a flat line running from the hip to the hem, and it finishes no edge, because there is no edge there. The listing files both under white trims on the neckline and waistline. The neckline is right. The waistline is not: the band is plain navy the whole way round.
The cutout is why the neck is high
A high round neck closes the front and a racerback closes the back, which between them leaves a garment with no air and no shape. The oval cutout between the shoulder blades is both. It is bound in the same white, about the width of a palm, and it sits above where a bra band crosses. Wear a high impact bra underneath and the band shows through the hole. Wear it alone and the hole is the only thing on the back.
A waistband with no story
Wide, flat, doubled, no drawcord, no elastic showing at the top edge. Below it runs a shallow curved seam that lifts the front panel, which is what the listing means by tummy control. It is a cut, not a gather. The back is the same story: the seam under the glutes is smooth and sewn flat. Scrunch usually means ruching, a line of gathered fabric pulled tight down the centre. This is not that, and it will not behave like it.
One line, and it is straight
The stripe begins at the hip, about a hand below the band, and ends at the ankle without tapering. It does not wrap over the hip and it does not continue onto the top, so the two pieces read as a pair by colour rather than by a line running through both. On a navy leg it does the one thing a side stripe is for: it draws the eye down the length of the leg instead of across it.
Seamless, and the seams that remain
Seamless knit removes the side seam and the front centre seam, which is why the leggings look continuous from band to ankle. It does not remove every seam. The curved panel under the waistband and the yoke under the glutes are both cut and sewn. What you get is no seam to sit on and none to rub. What you give up is any allowance to let out, and with it the pocket, the zip and the liner.
The chart has four sizes, the page says three
The size chart lists small, medium, large and extra large, with bust, waist and hip in inches. The bullets say three sizes available. This listing is large. The numbers that decide between medium and large are a bust boundary at 31.7 inches and a waist boundary at 27.3. On the line, go up: the knit gives about half a size at the hip and nothing at the band, because the band is doubled and does not stretch with the rest of it.
One colour on this page
The bullets offer black, navy and plum. This page sells navy, in one size, and there is no colour selector above the buy button, because the parent listing is this listing. Black and plum are separate pages, not swatches. Worth knowing before you order: every photograph here is navy, and a white stripe reads very differently against black.
What it is not
Not a romper. The crop ends above the band and there is skin between the two pieces. Not compression. High stretch, lightweight, and the fit type is listed as stretch rather than tight. Not a bra: no pad is mentioned anywhere in the listing, so treat the top as a tank. And the white is not a waistband trim, whatever the bullets say. Cold wash, no bleach, no softener, inside out, because on navy the first thing to go is the edge where white meets blue.