Which were clothed
labash (law-bash')
wrap around, i.e. (by implication) to put on a garment or clothe (oneself, or another), literally or figuratively
with blue
tkeleth (tek-ay'-leth)
the cerulean mussel, i.e. the color (violet) obtained therefrom or stuff dyed therewith -- blue.
captains
pechah (peh-khaw')
a prefect (of a city or small district) -- captain, deputy, governor.
and rulers
cagan (saw-gawn')
a prefect of a province -- prince, ruler.
all of them desirable
chemed (kheh'-med)
delight -- desirable, pleasant.
young men
bachuwr (baw-khoor')
participle passive of 977; properly, selected, i.e. a youth (often collective) -- (choice) young (man), chosen, hole.
horsemen
parash (paw-rawsh')
a steed; also (by implication) a driver (in a chariot), i.e. (collectively) cavalry -- horseman.
riding
rakab (raw-kab')
to ride (on an animal or in a vehicle); causatively, to place upon (for riding or generally), to despatch
upon horses
cuwc (soos)
from an unused root meaning to skip (properly, for joy); a horse (as leaping); also a swallow (from its rapid flight) -- crane, horse(-back, -hoof).