内揚げ
Meanings
1
inner pleat; inner tuck; fabric raised inside to adjust length
A tailoring technique used in kimono and yukata: excess fabric is folded up and stitched inside to shorten the garment while keeping the outer appearance neat. The term is domain-specific to traditional Japanese clothing.
I had the inner tuck of my kimono adjusted.
For a child's yukata, you adjust the length by making an inner tuck.