A knit fabric comprising a knit base containing at least one thread of a material, said thread changing its electrical resistance under the influence of moisture, is provided with an incorporated moisture sensor that comprises at least two spaced apart electrically conductive electrodes. Rows or columns of stitches of the knit base are located between the electrodes. Each of the electrodes contains at least one electrically conductive thread that is knit together with the knit base and that is in electrical connection with electrical connecting means (16) that are accessible from the outside.