Oh, and if you use Bootstrap you can add an extra 'fit adjustment' to say you have narrower shoulders than average.
On top of that you could their 'Pro-fit' facility (adding lots of extra detailed measurements as well as the standard ones). As part of this you can enter a figure for the distance from your neck to the tip of your shoulder and get the pattern customised.
If you do use the extra measurements be very careful, get someone else* to take the measurements, and order a free preview of the pattern so you can look at the overall shapes of the pieces and make sure you haven't done anything stupid. Don't ask me why I know that this is important...
*But not my huisband.