What undergarments to wear to first dress fitting?

I wore nude underwear and a nude strapless bra. The shop I went to had strapless bras there for people to wear if they didn't bring one, but I thought ahead about it.

If your dress doesn't have a built in bra, bring a strapless bra. While you are there, you can ask if they can build you one in or sew the strapless one in. And I understand about the "highly blessed and favored" issue you are having but I am going braless.

Bring anything you'd consider wearing the day of. I learned at my first fitting that I can't wear pantyhose or spanx because the back of my dress goes a tad too low (side note: nooooooo!)

Similarly, I'm having them build a bra in my dress because the back is sheer. I'd bring a strapless bra to see how it looks, and then talk to them about whether to wear it or have a bra built in.

I would bring anything you might possibly wear to the fitting. If that means running out this weekend and buying 3 different bras that might work that you might have to return afterwards, do it. You're close to your wedding so I'd try to nail it all down on the first fitting.

I'm not wearing a bra, the top of my dress is about 1/2in too small so they'll probably end up taking the cups out. I'm just wearing a nude thong and bringing my heels and the wedges I'll change into later in the night. My first fitting is Tuesday too

I agree with Mel on this one. I am a seamstress and have done a ton of wedding alterations. The bra can change the fit of the dress up to an inch depending on padding.. Crazy, right? I cant tell you how many brides or bridesmaids I have had come in for the final and the dress fits wrong.. Until I asked them if they changed their bra out and forced them to confess!! I suggest you wear the underthings to the fittings that you plan to wear on The Day, that will guarantee the best fit!