How floor-length bridal gowns work
With a floor-length gown, skirt shape and fabric determine how the hem moves in addition to how it looks standing still. Walk, sit and turn in the gown, especially if the venue includes stairs, grass or uneven ground. Floor length is a starting point, not a silhouette: the shape above the hem sets the character.
One length, different movement
Coral begins as a fitted floor-length lace column with linear beadwork; a separate Mikado-and-satin overskirt broadens it into an A-line and adds a chapel train. That is a different experience from a full skirt built into the gown. A train extends behind the floor hem; it is a separate length decision.
Sheath gowns et ball gowns can share a floor hem while moving very differently through the venue.