A bride is riding in a white carriage while her groom stands outside.
The bride's dress is white.
Especially nowadays, wedding dresses come in many different colors and shades, there is no reason to infer that this dress is white.
exists e1 p1 s1 x1 x2 x3.(exists e2 p2.(exists s2.(Theme(s2,x3) & a_outside(s2)) & Topic(e2,p2) & Actor(e2,x3) & v_stand(e2)) & n_groom(x3) & of(x3,x1) & n_female(x1) & while(e1,p1) & in(e1,x2) & n_carriage(x2) & a_white(s1) & Theme(s1,x2) & Actor(e1,x1) & v_ride(e1) & n_bride(x1))
exists s1 x1 x2.(n_dress(x2) & of(x2,x1) & n_bride(x1) & Theme(s1,x2) & a_white(s1))