Who coverest
`atah (aw-taw')
to wrap, i.e. cover, veil, cloth, or roll -- array self, be clad, (put a) cover (-ing, self), fill, put on, surely, turn aside.
thyself with light
'owr (ore)
illumination or (concrete) luminary (in every sense, including lightning, happiness, etc.) -- bright, clear, + day, light (-ning), morning, sun.
as with a garment
salmah (sal-maw')
a dress -- clothes, garment, raiment.
who stretchest out
natah (naw-taw')
to stretch or spread out; by implication, to bend away (including moral deflection); used in a great variety of application (out), stretch (forth, out), take (aside), turn (aside, away), wrest, cause to yield.
the heavens
shamayim (shaw-mah'-yim)
air, astrologer, heaven(-s).
like a curtain
yriy`ah (yer-ee-aw')
a hanging (as tremulous) -- curtain.