want to make shell, pattern calls for finished bust meas of 35 for ex small, 38 1/2 small and 41 1/2 for med. person is 36 bust measurement, which size should i make her?
It really depends on how she wears her clothing. There has to be a certain amount of ease, and I think that 5 inches of ease would be too much for a shell. I’d probably knit the 38 1/2.
If it’s not a surprise, ask her to measure a piece of her clothing that she likes the fit of. That’s your best guide.