We do two 5" (approx) sections of velcro on our Casuals (like the UPPER part of FHCG's picture), on both the outer and under aprons. If you give us your measurements as a 42" waist (as an example), then your velcro will MATCH UP at 42". If you gain or lose 2 to 3" to your waist, your velcro will still "grab".

Hope this info helps!