Is there a possibility to check if the saddle (still) fits?

The FittingSet can be placed on the back of the horse to first of all check the accuracy of the measurement. Later, the FittingSet can be used to check for alterations on the back. If it does not fit on the back any more, it may have change since the measurement has been done, what may make a saddle adjustment necessary. In this case you should contact your saddle expert.