A reference to the sacred vehicle(s) that the initiate must construct in order to ascend into the superior worlds. Various traditions number them differently depending upon the point of view. The physical, vital, astral, mental, and causal bodies that are created through the beginning stages of Alchemy/Tantra and that provide a basis for existence in their corresponding levels of nature, just as the physical body does in the physical world. These bodies or vehicles are superior due to being created out of Solar (Christic) Energy, as opposed to the inferior, lunar bodies we receive from nature. Also known as the Wedding Garment (Christianity), the Merkabah (Kabbalah), To Soma Heliakon (Greek), and Sahu (Egyptian).
"All the Masters of the White Lodge, the Angels, Archangels, Thrones, Seraphim, Virtues, etc., etc., etc. are garbed with the Solar Bodies. Only those who have Solar Bodies have the Being incarnated. Only someone who possesses the Being is an authentic Human Being." - Samael Aun Weor, The Esoteric Treatise of Hermetic Astrology
“All flesh [is] not the same flesh: but [there is] one [kind of] flesh of men, another flesh of beasts, another of fishes, [and] another of birds. [There are] also celestial bodies, and bodies terrestrial: but the glory of the celestial [is] one, and the [glory] of the terrestrial [is] another. [There is] one glory of the sun, and another glory of the moon, and another glory of the stars: for [one] star differeth from [another] star in glory.” - Paul, from 1 Corinthians 15
See also: What are the solar bodies?