[MeganJ]

not necessary until you are a B cup. just my opinion.

I wear one when exercising but thats it, and thats mainly for comfort than anything else.  I have had noticable breasts for over a year and they are still very firm with no downward droop.......am sure the day isnt far off when I need to wear one full time but I have a few more months or weeks at current progress! If anything wearing a bra might actually harm the development at the early stages. 

However, if you feel the need to wear a bra a wirefree one would probably work best.  You can also get vest tops with built in support which might work better than a bra if you feel the support is needed.