Bride vs. Bride to Be Attire. When to wear???

My very first wedding purchase was a Bride t-shirt and a Bride to Be t-shirt. I'll definitely wear the Bride gear during the wedding weekend and while getting ready. But when is it appropriate to wear the Bride to Be gear??? We're going to St. Martin next week for my birthday and I'm definitely wearing the Bride to Be t-shirt while on vacay! I'm too excited to be getting married and I want to rock SOMETHING with bride on it just to bask in the glory! But seriously, when should you wear Bride to Be gear? Or are they interchangeable??