More after the break...
Our Mrs. Reynolds:
Later in the series, this tan flightsuit was introduced:
Some screencaps from Ariel:
The tan flightsuit in Objects in Space:
In The Train Job, this sleeveless darker flightsuit makes an appearance:
And finally, his most light-colored tan flightsuit, worn here in Trash:
And here, in Safe:
In Our Mrs. Reynolds:
And in Out of Gas:
Of course, Wash wears these with his Tropical Shirts at times.
My Photobucket Album for Wash.
Serenifly Costumes site for Wash.