Any tips for measuring swimsuits

[plousia]

I found a super cute 1970s one-piece but am paranoid that I will measure it wrong and get the size wrong. I think I have it about right, but I am wondering if anyone has any tips for measuring swimsuits. I sort of stretched it out slightly while measuring, tried to measure around the inside of the cups, etc. Any ideas from more experienced people would be greatly appreciated!

 

[GemGem]

I’d love to know this too. Tbh I generally guess by trying it on over underwear to gage it. You can take measurements but some fabrics have a lot more give than others, as there are two way and I think 4 way stretch fabrics. Might even be more than that. Could potentially be a way to gage the amount of stretch from that but to be honest I’m not sure. Hopefully someone with more insight will respond. Might be helpful to post a picture of it too.

 

[plousia]

Yeah I thought of trying it on but I'm afraid of damaging it as I'm pretty sure it's smaller than I am. It's labelled a size 12 (North American) which I think is probably the equivalent of about a modern medium. That accords with the measurements I think I'm getting from it (36 bust, 32-33 underbust, 28 waist). I'm just a little paranoid of someone buying it and it not fitting. Here's a photo, I had to pin it on the dress form as I don't have the proper type of mannequin for it.