Matsya Purana 243.12

243.12

dhvajādiṣu tathā sthānaṃ kravyādānāṃ vigarhitam.
skhalanaṃ vāhanānāñca vastrasaṅgastathaiva ca .. 243.11 ..

If a Râkṣasa sits on a banner it is unlucky and so are the falling down of the conveyances, the overlapping of the dress, the striking of the head against the door, the falling down of the banner umbrella, cloth at the time of departure are unlucky signs —11-12