hitoeは「単」。

うっすらと開きかけた蕾の形状から、満開に咲き誇る姿まで、一つとして同じ表情を見せるものはありません。

"hitoe" means unlined garment and also single flowers.
From the shape of the bud which was about to open slightly to a figure in full glory in full bloom, the works never show the same expression at all.