I found this great cotton lawn fabric in a charity shop, I think it was around £4. Bargain. I traced the outline of a favourite shirt to make the paper pattern and then adjusted what I needed to.
I haven't made any cuffs as I find them really annoying, so I just kept the sleeves at bracelet level.
I drew a curve down from the original centre neckline and swept it sideways to create a curved button placket .