A method for configuring a wristwatch wriststrap for a given wearer, characterized in that it comprises the following steps: - a first step (E1) of acquiring at least one morphological data item (1; 2) pertaining to the wearer of the wriststrap; - an intermediate step (E2) of automatically determining at least one optimal configuration (c*) for the wriststrap suited to the wearer, comprising at least determining the strap length adjustment, from the at least one morphological data item (1; 2), this intermediate step (E2) of determining the at least one optimal configuration for the wriststrap comprising determining configuration data using all or some of the following steps: - determining the type of wriststrap; and/or - determining the strand or strands and/or the clasp; and/or - determining the number of links or linkages, notably the number of extension linkages or links, for at least one strand of the wriststrap; and/or - determining the configuration or configurations of at least one link or of at least one linkage for at least one wriststrap strand; and/or - determining the positioning of an end linkage of a wriststrap strand relative to a wriststrap clasp and/or relative to a watch case; and/or - determining one or more configurations of the wriststrap clasp; and/or - determining the length adjustment or adjustments within the wriststrap clasp; - a second step (E3) of preparing the wriststrap for the wearer, to an optimal configuration determined in the preceding step. - a first step (E1) of acquiring at least one morphological data item (1; 2) pertaining to the wearer of the wriststrap; - an intermediate step (E2) of automatically determining at least one optimal configuration (c*) for the wriststrap suited to the wearer, comprising at least determining the strap length adjustment, from the at least one morphological data item (1; 2), this intermediate step (E2) of determining the at least one optimal configuration for the wriststrap comprising determining configuration data using all or some of the following steps: - determining the type of wriststrap; and/or - determining the strand or strands and/or the clasp; and/or - determining the number of links or linkages, notably the number of extension linkages or links, for at least one strand of the wriststrap; and/or - determining the configuration or configurations of at least one link or of at least one linkage for at least one wriststrap strand; and/or - determining the positioning of an end linkage of a wriststrap strand relative to a wriststrap clasp and/or relative to a watch case; and/or - determining one or more configurations of the wriststrap clasp; and/or - determining the length adjustment or adjustments within the wriststrap clasp; - determining the type of wriststrap; and/or - determining the strand or strands and/or the clasp; and/or - determining the number of links or linkages, notably the number of extension linkages or links, for at least one strand of the wriststrap; and/or - determining the configuration or configurations of at least one link or of at least one linkage for at least one wriststrap strand; and/or - determining the positioning of an end linkage of a wriststrap strand relative to a wriststrap clasp and/or relative to a watch case; and/or - determining one or more configurations of the wriststrap clasp; and/or - determining the length adjustment or adjustments within the wriststrap clasp; - a second step (E3) of preparing the wriststrap for the wearer, to an optimal configuration determined in the preceding step. <EOS>