Appropriate Undergarments
If you're baffled about what to put on to a bridesmaid dress fitting, begin with the basics—underwear. The bridesmaid should wear the precise undergarments that they plan on wearing the day of the wedding to her dress fitting.

Since you aren't sure the way the white bridesmaid dresses will fit, take along a couple of different bra options, especially a strapless version, to determine what one is preferred and is most effective with the gown. Keep it basically by sticking with seamless styles and nude hues, since nobody wants to see your cheetah-print bra protruding. If the dress includes a low or open back, it could even have cups sewn in, but having bra variations it's still helpful.

Shoe Options
The bride may request you to pick up a unique pair of shoes that are a certain style or color, but, for the time being, bring a few different shoe options to try the gown with. That way, you can give her a heads-up on which shoes you believe will work best while you are trying on bridesmaid gowns. Dresses are often designed for a 5'10" bridesmaid, so bring shoes having a similar heel height to the ones you may wear around the big day. This will figure out how much hemming must be done or, a high-level bit taller, whether you will need extra length added to the gown.