Leg-Slit Gown

Standing Height Is Not Sitting Height

A slit that ends mid-thigh in the mirror opens considerably further once you sit down. Two things happen at the same time: the skirt slides back as you lower yourself, and the thigh spreads against the chair, which pulls the opening wider than it was cut. The number that matters is where the top of the slit lands seated, and it is the one almost nobody checks in the fitting room.

This is worth an actual measurement rather than an impression, because the difference between comfortable and not is usually about three inches of seam, and a seamstress can raise the bottom of the opening far more easily than she can lower the top of it.

What A Slit Rules Out

• Thigh-length shapewear. Its hem becomes visible the moment the opening moves, which is exactly when you are seated and least able to fix it.
• Hold-up stockings. The band sits in the range the slit exposes. Tights or bare are the workable answers.
• A wrap as a cover. A shawl travels with your shoulders and leaves the slit uncovered at the moment you sit, so it solves cold and nothing else.

The Skirt Underneath Changes The Effect

On a mermaid skirt, the slit sits within a shape that is already narrow, so it functions mostly as movement rather than exposure and is close to necessary if you intend to dance. On a ball skirt the opening disappears into the volume and only appears when you walk. An A-line falls between the two and shows the slit most consistently, because the skirt is already moving away from the leg.

Fabric weight decides whether the opening stays where you put it. Crepe and satin hang from their own weight and hold the line. Chiffon and tulle travel, which is worth knowing before an outdoor ceremony, where a light skirt and any wind at all will open the slit past its cut height and keep it there.

Holding It Where You Want It

• Fashion tape at the top of the opening. A single strip fixes the height for the evening and survives sitting down repeatedly, which pins and safety clips do not.
• Test it in the shoes you will wear. Heel height changes the angle of the whole skirt and moves the slit with it.
• Walk the length of the room, then sit, then stand. The sequence is what an evening actually consists of, and a slit that survives all three is the right one.