Hi all--I'm new to posting here, but I confess I've shyly lurked a bit

I'm getting married on June 6th.
For the girls who've had a bra/cups sewn into your dress...did you buy a strapless backless bra, or some other cuplike contraption? I can't stand longline bras, so I'm looking for something with a little boost to put into the dress itself. Any recs on where to buy in SJ, too?
Also, I bought my dress at Irma's but am thinking about going to Yeon for alterations since she gets so many raves here. How far in advance should I go for a first fitting, and should I have the bra stuff with me for it?
Sorry for the barrage of questions and thanks in advance for your help!