A computer-implemented method for selecting a pre-fabricated compression garment configured for a body part that is an arm or a leg of a person in need of compression therapy, comprising: a. selecting a body part that is an arm or a leg of a person in need of compression therapy for fitting with a pre-fabricated compression garment, wherein the compression garment is fabricated from an elastic material and comprises one or more compression values configured to apply a prescribed or indicated level of compression therapy to the selected arm or leg when, in use, the compression garment is worn by the person on the selected arm or leg; b. acquiring digital images of the selected arm or leg; c. processing the acquired digital images to generate shape description information comprising three-dimensional geometric information for the selected arm or leg; d. deriving wearer fit information for the selected arm or leg from the shape description information comprising: i. a plurality of outer circumference measurements at a plurality of arm or leg locations along the length of the arm or leg; and ii. length information of the arm or leg; e. providing compression garment fit information from a plurality of pre-fabricated compression garments configured for either an arm or a leg, wherein for each of the plurality of pre-fabricated compression garments the fit information comprises: i. each of a plurality of compression garment circumference measurements at the same locations as the wearer fit locations; and ii. a garment length; f. comparing, the wearer fit information with the compression garment fit information for each of the plurality of pre-fabricated compression garments; and g. identifying at least one pre-fabricated compression garment having garment fit information that is closest to the wearer fit information, wherein the identified compression garment is configured to provide the prescribed or indicated amount of compression therapy to the selected arm or leg when the selected pre-fabricated compression garment is worn on that arm or that leg by the person in need of compression therapy. a. selecting a body part that is an arm or a leg of a person in need of compression therapy for fitting with a pre-fabricated compression garment, wherein the compression garment is fabricated from an elastic material and comprises one or more compression values configured to apply a prescribed or indicated level of compression therapy to the selected arm or leg when, in use, the compression garment is worn by the person on the selected arm or leg; b. acquiring digital images of the selected arm or leg; c. processing the acquired digital images to generate shape description information comprising three-dimensional geometric information for the selected arm or leg; d. deriving wearer fit information for the selected arm or leg from the shape description information comprising: i. a plurality of outer circumference measurements at a plurality of arm or leg locations along the length of the arm or leg; and ii. length information of the arm or leg; i. a plurality of outer circumference measurements at a plurality of arm or leg locations along the length of the arm or leg; and ii. length information of the arm or leg; e. providing compression garment fit information from a plurality of pre-fabricated compression garments configured for either an arm or a leg, wherein for each of the plurality of pre-fabricated compression garments the fit information comprises: i. each of a plurality of compression garment circumference measurements at the same locations as the wearer fit locations; and ii. a garment length; i. each of a plurality of compression garment circumference measurements at the same locations as the wearer fit locations; and ii. a garment length; f. comparing, the wearer fit information with the compression garment fit information for each of the plurality of pre-fabricated compression garments; and g. identifying at least one pre-fabricated compression garment having garment fit information that is closest to the wearer fit information, wherein the identified compression garment is configured to provide the prescribed or indicated amount of compression therapy to the selected arm or leg when the selected pre-fabricated compression garment is worn on that arm or that leg by the person in need of compression therapy.