We are using a new clothing manufacturer this year called CCN. 

Size can be estimated using the body measurements in the table below.

Note that Items labelled as "training" are a looser cut, with more room.

Items labelled as "Pro" are race cut.  Intended for pretty slender people.

There is no youth sizing but items go down to 2XS.

It may be good to estimate  size based on the table below and choose the larger size based on measurements.

Women specific cut are only available in "PRO" items.