The pattern of the sun — Sun Helmet

The pattern of the sun 1
Can fit but him alone
For sheen must have a Disk
To be a sun-
(F.1580/J.1550)
[1] sun:: sun helmet.
[2] fit, alone:: symbolic meaning of the helmet, not the size. The man's style fits to sun helmet.
[3] sheen:: glittering, showy dress. Disk:: something flat and round, a hint on the aureole.
[4] sun:: glorious, god-like symbol.

We are in full jungle costume, sun helmets of classic form, flannel shirts innocent of collars; coats and trousers of light fabric and colour; our shoulders adorned by flask-sustaining belts. ─ The United Service Magazine (1862)

The chief, Oto, went about with three bright-coloured cricket belts round his middle, but he provokingly wore a sun helmet, given to him by the captain, in order that he might readily distinguish him amongst the crowd, by proxy. ─ Pamphlets on Biology (1863)

The serpent was the symbol of the sun-gods. Ra, Ar, or Erra, Iar, Horus was in Egypt represented with the serpent (Uraeus) and the sun's disk. ─ Vestiges of the Spirit-History of Man (1858)