Clothing comfort is very important feature which is considered as a result of different process of heat exchange between human body, clothing and environment. The purpose of this paper is to analyse the impact of clothing insulation on the heat transfer. The measurements were carried out on commercially 1x1 RIB knitted fabrics used for the production of next-to-skin shirts. The one group of samples are made from 100% cotton yarn and another with 96% cotton and 4%lycra. It is noticed that knitted material composition affected the change in heat resistance. Also, this paper presents and verifies the correlation between the measured values of thermal resistance (Rct) and the knitwear thickness (dpl), the covering factor (K), the porosity of the twists (e) and the surface coefficient (dp). Based on these results, a mathematical model for calculating thermal resistance is proposed. Comparing the results obtained with the proposed equation and the measured results, we can see that the deviations are minimal. The highest deviation for sample C4 is 0.05%,while the largest deviation for sample CL4 is 4.6%.

This paper analyzes the impact of the yarn linear density used in the dimensional stability of the 1x1 RIB knitwear made on the same circular knitting machine. The used samples of raw knitwear are made from 100% cotton yarn with different liner densities of 19, 17, 15 and 13 tex. Dimensional stability of these samples was analyzed by FAST 4. The results show that the most stable knitwear is made of 100 % cotton yarn with the linear density 19 tex.The values of the tightness factor in the dry relaxation stood at 14, 93, 15, 14under wet,16,32 under total and 16,20 under air conditioned conditions. The knitwear with the highest values of dimensional instability is a raw knitted fabric made of 100% CO, and the yarn with the linear density of 13 tex. The values of the tightness factor in the dry relaxation stood at 16,20 under wet, 15,14 under total and 12,53 under air conditioned conditions.

This paper analyzes the impact of knitwear’s fiber composition, linear density and finishing of yarn used in the dimensional stability of the 1x1 RIB knitwear made on the same circular knitting machine. Dimensional stability of these samples was analysed by FAST 4 method. Different samples were compared across multiple indicators. The results show that the most stable dyed knitted fabric are made of cotton 96% and 4% of Lycra and of yarn with linear density 19.14 tex. Tightness factor’s values in the dry relaxation stood at 17.90, in the wet 18.45, in total 18.73 and 18.59 in air conditioned terms. Knitwear with the highest values of dimensional instability are raw knitted fabric made of 100% CO, and yarn with linear density of 13.39 tex. Tightness factor’s values in the dry relaxation stood at 12.16, in the wet 12.36, in total 13.26 and 13.35 in air conditioned terms