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I am struggling with these white lymantriinae as usual. It seems most like Urocoma (Euproctis) panabra, but doesn't neatly fit any species for one reason or another, morphologically or geographically. Acyphas semiochrea
All Bold specimens are from Tasmania with one from WA
Only BOLD specimen from WA (from south) is all white in antennae and abdomen.[https://www.boldsystems.org/index.php/Public_RecordView?processid=ANICE366-10]
None of the BOLD specimens that can show the abdomen show any orange on the abdomen and most show dark antennae eg [https://www.boldsystems.org/index.php/Public_RecordView?processid=ANICE398-10]

Urocoma (Euproctis) panabra
Only specimens on BOLD and iNaturalist are from east coast. The following notes are mainly from @vicfazio3 notes on various postings so apologies to Vic if I have misinterpreted:
Satiny, sparkly finish
Orange-tinged ‘hair-like’ scales (mine lacks these unless the orangey abdomen scales were longer originally)
Orange-tinted antennae
Orange tinge to abdomen (this does not seem to show on BOLD specimens, just the orange tail)
Orange tinge to inside of forelegs

Vic mentioned on one of @dustaway postings in relation to this species “Working through the white tussocks ... Acyphas / Euproctis / Urocoma, I am guessing the ID separation here has to do with the two-toned shaded look effected by the silvery outer border of the forewing? If so, foreshadowed but the latin name. Panambra = penumbra ... referencing a shadow cast by an opaque object or a partially shaded outer region.”

Acyphas chionitis
All white
Only specimens on BOLD are from east coast