Vehicle door assembly comprising a door body and a sliding window arrangement, the sliding window arrangement comprising: a window panel; a guide element attached to the door body; at least one seal (120, 122) for creating a seal between the window panel and the door body; wherein the window panel is movably coupled to the guide element to be movable from a closed position to an open position and from the open position to the closed position; wherein, in the open position of the window panel, the window panel is received within a receiving aperture of the door body; wherein • the guide element is configured such that, in order to move the window panel from a closed position to the open position, the window panel moves along a first direction with respect to the guide element to align with the receiving aperture of the door body and moves along a second direction with respect to the guide element to be received within the receiving aperture of the door body; and/or • the guide element is configured such that, in order to move the window panel from the open position to a closed position, the window panel moves along a second direction with respect to the guide element out of the receiving aperture and moves along a first direction with respect to the guide element to flush with a side panel of the vehicle door assembly; and wherein the sliding window arrangement is configured such that the at least one seal (120, 122) moves at least along the first direction when the window panel moves along the first direction; characterized in that the sliding window arrangement is configured such that the at least one seal (120, 122) does not move along the second direction when the window panel moves along the second direction. a window panel; a guide element attached to the door body; at least one seal (120, 122) for creating a seal between the window panel and the door body; wherein the window panel is movably coupled to the guide element to be movable from a closed position to an open position and from the open position to the closed position; wherein, in the open position of the window panel, the window panel is received within a receiving aperture of the door body; wherein • the guide element is configured such that, in order to move the window panel from a closed position to the open position, the window panel moves along a first direction with respect to the guide element to align with the receiving aperture of the door body and moves along a second direction with respect to the guide element to be received within the receiving aperture of the door body; and/or • the guide element is configured such that, in order to move the window panel from the open position to a closed position, the window panel moves along a second direction with respect to the guide element out of the receiving aperture and moves along a first direction with respect to the guide element to flush with a side panel of the vehicle door assembly; and • the guide element is configured such that, in order to move the window panel from a closed position to the open position, the window panel moves along a first direction with respect to the guide element to align with the receiving aperture of the door body and moves along a second direction with respect to the guide element to be received within the receiving aperture of the door body; and/or • the guide element is configured such that, in order to move the window panel from the open position to a closed position, the window panel moves along a second direction with respect to the guide element out of the receiving aperture and moves along a first direction with respect to the guide element to flush with a side panel of the vehicle door assembly; and wherein the sliding window arrangement is configured such that the at least one seal (120, 122) moves at least along the first direction when the window panel moves along the first direction; characterized in that the sliding window arrangement is configured such that the at least one seal (120, 122) does not move along the second direction when the window panel moves along the second direction.