Toledo are certainly shown in brown by 1811 (see Osprey #2). I don't have my Bueno book here, so not sure about the hussars. The book on Spanish hussars has several other regts, but unfortunately only mentions the Castilla in a table.
Isn't there a reference to a parade in around 1810 in Oman where the Spanish infantry uniforms are described. Again, Oman isn't here for me to check.
I'll see what I can find after the w/e.
Swampster