Sewing patterns have not been upgraded or modernized since about 1967. and the size Size 10 has been kind of standardized as 'average.' Average has gotten larger in 40 years. 10 is still average, but it's very different than it was 40 years ago.

My advice would be to measure something that fits you now, and trace off that size (remember to exclude the seam allowances), regardless of what the number is. I would also add an extra 3/4" or 1" to each of the side seams when I cut out, and sew wide side seams, just in case.

It's very frustrating. I made a dress this spring and took it in at least three inches even though my measurements indicated i should cut our a size 16. This is why I don't sew clothing for myself, in spite of being a professional seamstress.

Yes, I agree. Measure something that fits you and choose a size based on that. If you have B cup or smaller, you should use your full bust measurement. If larger, you need to use your high bust measurement. https://www.sewlisette.com/blog/2015/03/finding-your-sewing-pattern-size/

Measure yourself ... ready to wear sizing is all over the place and is based more on appealing to vanity than anything. There are shops where you would be wearing a 10 and a slender woman wearing a -4 !

I am small busted but have a large back and shoulders Pick the pattern according to the "high bust" (under the arms, above the breasts) because altering the upper bodice area is a PITA compared to adjusting for breast size. The less messing your do with shoulders and armholes the better.

And there is this method - measuring straight across the upper chest, which gets you a pattern that needs the fewest shoulder alterations.

Thanks to everyone! According to my measurements and the Simplicity chart, I AM a size 18. The Right Size measurement also makes me an 18. I need to just get over it and start making these shirts.

I did see in clt3's link that " In general, I’ve found that most women’s pattern sizes are approximately two dress sizes larger than their ready-to-wear size. "

That makes me feel better: that would correspond to my usual 14.

I thought of using some swedish tracing paper or thin interfacing to copy the pattern in this size for a test fit, but that really increases the work level of this project.

I think I'll start with the least fitted, flowy pattern and see where that takes me.

RTW i could be anywhere from 8 to 12, and larger if I ventured into a bridal shop for a special occasion dress. I measure 16, sometimes it fits, sometimes it's huge. The last dress I made, that I took in 3 inches on the sides? The sleeves were barely big enough around. I don't have beefy arms, either.

You would think the time has come for a universal set of sizes. Eventually it will be metric.

It's crazy. Just get some help getting your measurements together and use those measurements, only. Retailers have decreased their sizes because we keep increasing our's, lol Everyone in the fabric store's in the same boat. Your custom made clothes will fit while the retail clothes will need alterations!