The verb "vestirse" (to dress oneself) is a reflexive verb that uses the stem-changing pattern e:i. Here is its complete conjugation:
Blank 1: me visto (yo)
Blank 2: te vistes (tú)
Blank 3: se viste (él/ella/Ud.)
Blank 4: nos vestimos (nosotros)
Blank 5: os vestís (vosotros)
Blank 6: se visten (ellos/ellas/Uds.)