By white night-gowns.
None are green,
Or purple with green rings,
Or green with yellow rings,
or yellow with blue rings.
None of them are strange,
With socks of lace
And beaded ceintures.
People are not going
To dream of baboons and periwinkles.
Only, here and there, an old sailor,
Drunk and asleep in his boots,
Catches tigers
In red weather.
The sailor is having some synesthesia-mixed perceptions during his drunk dreaming…or else he is just dreaming of tiger hunting at sunrise or sunset. 
 
 Stevens may have in mind the old saying, “Red sky at night, sailors' delight; red sky at morning, sailors take warning.” Since it’s 10 o'clock at night, the suggestion would be that the sailor (the only imaginative figure in the poem) is delighting in his dream. 
 These lines may also be a subtle callback to the famous “burning” tiger of the  William Blake poem.
Disillusionment of Ten O Clock