An assembled textile product, in particular a jacket, a pair of trousers, a men's suit, a women's dress or another textile product assembled from a plurality of parts of fabric, comprising a plurality of parts of fabric cut from one or more open pieces of fabric, wherein - a plurality of such parts of fabric of the textile product consist of respective portions of a knitted tubular fabric made by means of a circular knitting machine for hosiery or by means of knitting machine for knitwear; - said knitted tubular fabric has a heat adhesive material applied under heat onto at least one portion of a surface of the fabric so as to stabilize the fabric itself, characterized in that the assembled textile product is obtained by means of the following steps: - arranging a tubular knitted fabric produced by means of a circular knitting machine for hosiery or by means of a knitting machine for knitwear, or producing the knitted tubular fabric by means of a circular knitting machine for hosiery or by means of a knitting machine for knitwear; - pulling the tubular fabric produced by the knitting machine onto a support so as to stretch the tubular fabric with a predefined tensioning degree of the fabric, so that at least part of the inner surface of the tubular fabric contacts the support and an outer surface of the tubular fabric is still accessible; - applying a heat adhesive material onto at least a first portion of an outer surface of the tubular fabric pulled over the support, and letting the heat adhesive material firmly adhere under heat onto the tubular fabric so as to stabilize the first portion of fabric reducing its elasticity and/or deformability; - cutting the tubular fabric onto which the heat adhesive material has been applied, so as to obtain an open piece of fabric; - cutting the open piece of fabric according to predefined cutting lines for obtaining one or more parts of a textile product to be assembled; - assembling a plurality of parts obtained from said open piece of fabric or from a plurality of pieces of fabric for obtaining an assembled textile product, in particular a jacket, a pair of trousers, a men's suit, a women's dress or other textile products assembled from a plurality of parts; and wherein: - the parts of fabric are provided with a heat adhesive material applied, under heat, onto a whole surface of the fabric. - a plurality of such parts of fabric of the textile product consist of respective portions of a knitted tubular fabric made by means of a circular knitting machine for hosiery or by means of knitting machine for knitwear; - said knitted tubular fabric has a heat adhesive material applied under heat onto at least one portion of a surface of the fabric so as to stabilize the fabric itself, - arranging a tubular knitted fabric produced by means of a circular knitting machine for hosiery or by means of a knitting machine for knitwear, or producing the knitted tubular fabric by means of a circular knitting machine for hosiery or by means of a knitting machine for knitwear; - pulling the tubular fabric produced by the knitting machine onto a support so as to stretch the tubular fabric with a predefined tensioning degree of the fabric, so that at least part of the inner surface of the tubular fabric contacts the support and an outer surface of the tubular fabric is still accessible; - applying a heat adhesive material onto at least a first portion of an outer surface of the tubular fabric pulled over the support, and letting the heat adhesive material firmly adhere under heat onto the tubular fabric so as to stabilize the first portion of fabric reducing its elasticity and/or deformability; - cutting the tubular fabric onto which the heat adhesive material has been applied, so as to obtain an open piece of fabric; - cutting the open piece of fabric according to predefined cutting lines for obtaining one or more parts of a textile product to be assembled; - assembling a plurality of parts obtained from said open piece of fabric or from a plurality of pieces of fabric for obtaining an assembled textile product, in particular a jacket, a pair of trousers, a men's suit, a women's dress or other textile products assembled from a plurality of parts; and wherein: - the parts of fabric are provided with a heat adhesive material applied, under heat, onto a whole surface of the fabric.