inner front panel; underlap
Refers to the part of a kimono or similar wrapped garment that is tucked closest to the body, under the outer front panel (上前). Used in contexts of dressing, tailoring, or describing kimono construction.
See also: 上前
When putting on a kimono, first bring the inner front panel together, then overlap the outer front panel.
The collar of the inner panel is showing a little, so please fix it.
Compound of 下 (した, 'under') and 前 (まえ, 'front'), referring to the inner front panel of a wrapped garment.