how to make a v-neck halter dress more modest?

I was shopping today at Macy's and I found a gorgeous turquoise halter dress. The only thing is, my mom thinks the neckline is too low. I was wondering how to fix this. I thought I could layer the dress with a bandeau or something, but is there another way? Thanks.

A bandeau is a good idea, maybe a lace one to make it dressy, maybe a v-neck cami so you dont have different hems. you can also do a shawl over it or a cardigan depending where you are going to wear the dress to...

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