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I doubt this is Anachloris subochraria which is a reasonably common, day flying moth that has only been recorded in southern Australia (iNat/BOLD Hobern) - just N. of Perth and S. of Brisbane. Above moth lacks the dark oblong patch on the forewing inner margin of A. subochraria ; shape of the post medial line is wrong; has a dash mark not a dot and lacks the diagonal line to the apex.
It is quite possibly a Dichromodes sp - 34 sp have been recorded in WA (iNat) although only one D. usurpatrix is recorded in the Kimberley and it is not that species. It is quite like D. ornata but this has only been recorded on the east coast as far north as the Sunshine Coast. Above moth seems to lack some characteristic markings of D. estigmaria which has only been recorded on the east coast from Victoria to south of Maryborough in Queensland.
Another less likely possibility is that it is a Hypernine moth.
An interesting sighting. Several clear shots of different aspects (from above, in profile, close up of head in profile) would help I.D.