REGULAR Standard Large for size 12 plus. It's more like a size 8. But then I'll use it as I like the crew neck size and I can cut off the sleeves to make it easier to wear. Anyway, I use it because the colors are clean and just what I need to wear under cotton blouses or sweaters. Looks like I'll have to order a large one. Standard size 14 for girls. I have a small frame and only 85 pounds. It would be nice to get it right for a standard size.
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