People running in a marathon in running clothes.
The people are in exercise clothes.
Just because people are in running clothes, it does not mean that they are particularly exercise clothes.
exists e1 e2 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_run(e2) & n_clothes(x5) & (x3 = x4) & n_marathon(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_people(x1))
exists p1 x1.(n_people(x1) & exists x2 x3.(in(x1,x2) & n_clothes(x2) & of(x2,x3) & n_exercise(x3)))