What do I wear under the dress?

Hi moms! I need your help!! I haven't really had a chance to dress up like this before, so I'm pretty confused! I thrifted this one online and I love it(a little big but still fits good)! But what do I wear under this dress? What kind of under shirt? Regular bra...? I have no idea. Help me please!! Thank you 🙇‍♀️🙏

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I would wear a regular bra. I usually wear spanx if I'm dressing up to hold in my stomach and thighs...I buy the long shorts version so I get more coverage and it makes me feel more comfortable in a dress to have shorts on underneath. Depending on the top cut, you might want an undershirt with lace if it's showing too much cleavage.

It depends what the back looks like. Maybe a cross strap in the back. It's so pretty! I love that app

Thank you, both of you!!!🥰 The back is not wide open, so I will take a look at spanx.