Design some Fashion

Ok ladies and gentlemen, here we go. I am looking for someone who has experience in apparel design and can concoct dimensions for me to take to a manufacturer. I am creating a line of men's underwear and the most important facet is of course the crotch area. I am looking to accentuate the natural contours of both the front and back while maintaining 'breathability'. As far as the front is concerned, I am targeting an audience that has little recourse when it comes to undergarments. Men that are thinner or fit tend to have smaller to slightly smaller waists but this smaller waistline does not reflect the concerns of the reason why we wear underwear in the first place. Smaller sized underwear is crowded, cramped and constricts. You're the designer but my thought was to have a separate piece of fabric that would act as a compartment. This "compartment" needs to be breathable, I don't want it to ride, aesthetically pleasing (should accentuate the grandeur, if you know what I mean) and be supportive without constricting. What I am looking for in specificity: Design dimensions for sizing, XS-L (Waistlines can be standard but crotch area should be taken into account as mentioned above) Suggestions for fabrics I have color patterns in mind but we can discuss Sketches, so I can see that you understand what I'm looking for and I have something to bring to the manufacturers. I'm looking to do more of this in the future, beyond the underwear and am looking to find someone that I can go back to time and again so let's get this going! Only two things that I implicitly ask are be honest and follow through. Please let me know if there is anything else that you need to know and I'm looking forward to talking!