The invention relates to a garment (10 100) including a knitted, circumferentially-extending welt portion having a anti-slip zone (50) comprising a high friction yarn (61, 62, 63) integrally formed on a inner face of a main garment portion (11 110) such that the high friction yarn contacts a wearers skin to increase the anti-slip properties of the garment. The invention also relates to a method for constructing such a garment.