Both wore the dress of Mexican gentlemen, their short jackets glinting with silver braid and embroidery; their bridles, horse gear, and saddles were rich in scrolls and decorations of the same metal.
They may have dressed like Mexican gentlemen but they were not really gentlemen.  
mnli hypothesis: They may have dressed like Mexican gentlemen but they were not really gentlemen.   premise: Both wore the dress of Mexican gentlemen, their short jackets glinting with silver braid and embroidery; their bridles, horse gear, and saddles were rich in scrolls and decorations of the same metal.