A method for making assembled textile products including the following steps: arranging open piece of fabric, made by producing tubular knitted fabric by means of circular knitting machine for hosiery or for knitwear, by pulling tubular fabric over support so as to stretch tubular fabric, by applying heat adhesive material onto at least first portion of an outer surface of tubular fabric pulled over support letting heat adhesive material firmly adhere under heat onto tubular fabric, and by cutting tubular fabric onto which heat adhesive material has been applied, so as to obtain open piece of fabric; cutting open piece of fabric according to predefined cutting lines for making one or more parts of textile product to be assembled, and assembling plurality of parts obtained from open piece of fabric or from plurality of pieces of fabric for obtaining assembled textile product.