A lower garment for a female person has a mechanism that when engaged, secures the garment to the female person, and a fly opening implemented at a specific position in a fabric of the garment, the fly opening comprising a substantially straight slit of a first length covered by a flap of fabric stitched to the fabric of the garment around the slit such that the slit is covered by the flap except for an un-stitched edge of the flap of a length equal to the length of the slit. The specific position in fabric of the garment is a position that enables the female person to engage a tubular portion of an external device through the fly opening, and to move the tubular portion to her vulva and insert same to position of the urethra without disengaging the mechanism that secures the garment to the female person.