The aim of this paper is to investigate the formation and evolution of the celestial object, known as gravastar. The idea of this gravitationally vacuum star is suggested by Mazur and Mottola. In general, the gravatar is assumed to be composed of three distinct regions. These regions are explained thoroughly with the help of certain equations of states and the values of metric coefficients corresponding to these sectors are also determined. The perfect fluid and cylindrically symmetric metric are assumed to derive Bianchi identities and modified field equations. The internal and external geometries are combined with each other at intermediate thin shell and specific conditions are used for this purpose. In the framework of an alternative gravitational theory, i.e., f (G, T) theory, we calculate a regular solution for gravastar along with the elaboration of specific substantial attributes of the model. The significance of f (G, T) theory for attaining gravastar model is also studied.