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Is 70° warm enough to wear a thin-strap dress?

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I'm going on a field trip to the Museum of Fine Arts in Boston today, and It's going to be 70° outside, and I want to be comfortable. I have this dress that's about to my knees in length, but the straps are like 1-finger length. I don't want to be cold, but I reaallyy dont want to wear a cardigan or a sweater over it because my favorite part of the dress is the top and It would really stink for me to cover it up, the one chance I get to wear this dress. Any advice?