From Style Arc:
WILLOW PANT: Wonderful classic slim line woven pant featuring a side zip. This pant looks amazing worn with heels or worn casually with flats. Willow sits on the real waistline.
Willow has positive ease of 2cm or ¾ inch as it’s a tailored slim line pant.FABRIC SUGGESTION & DESCRIPTION: Any woven fabric suitable for a pant