This paper reported the evaluation, discussions, and results of our study on thermal comfort properties of jeggings manufactured by the use of eighteen different types of fleeced knitted fabrics, all of which have been specially designed and produced as to get denim-like appearance. Jeggings, originally, defines tight-fitting stretch pants for women, styled to resemble a pair of denim jeans. Thermal comfort properties of jeggings are of great importance since they are usually used as summer clothes. Tests were performed on air permeability, water vapor permeability, thermal resistance, and absorptivity of the fabrics. Air permeability has been realized under a constant air pressure by the use of SDL Atlas Air Permeability Tester according to the ISO 9237 standard (ISO 9237:1999: Textile-Determination the Air Permeability of Textile Materials, ISO, Geneva, Switzerland, 1999). Water vapor permeability test results were obtained as the index values using SDL Atlas Rotational Platform Tester according to ASTM E96/E96M-14 (Standard Test Methods for Water Vapor Transmission of Materials, ASTM International, West Conshohocken, PA, 2014, www.astm.org). Thermal resistance and thermal absorptivity tests have been applied on an Alambeta tester. The main goal of the study, besides a contribution to the literature to extend the knowledge in this field, was choosing the best suited fabric or fabrics that were comparatively better than the others examined in this study in terms of the optimized characteristics for wearing cloths as jeggings in summer. Hence, the overall test results were compared in graphic form and evaluated statistically using the SPSS 17.0 package program. Additionally, the multi-response optimization method was applied on the data using the Design Expert 8.0 package program to help for selection of convenient fabric/fabrics for this purpose. At the end of the study, it was found that the fabrics which have bamboo and modal fleecy yarns are suitable for summer wear.