Heortia vitessoides?
First image is 1:1 magnification of early instars, second image is not magnified at the same age.
Have been completely defoliating a 14ft Phaleria clerodendron tree each time it regrows its leaves for nearly 2 years.
Caterpillars form “nests” among curled leaves, create long silk “drop threads” and are in astonishing numbers.
35mm photo, appeared to be sub-adult.
Blind, was skinny when found. Ate a few insects, then didn't eat for days even though we tried to feed it.