What should we wear on twin day?

Im in 8th grade & twin day is coming up very shortly. My friend & I are going to be twins for twin day. . She wants to shop in side of Hollister but ive never shoped in there before. I heard that hollister has nice clothes but idk how tru that is. I am very tall & skinny. I shopped inside of this place called charlett ruse before & i like how there clothes fit the only thing is that i fit a size three. I I really wear a size three but its kinda baggy. I fit a size 0 nicely though because it fits tightly. I dont like when my clothes is big on me i like when they are tight. Also how much is hollister clothes it is expensive because i no its a name brand store.