Custom casual button-down, casual, collared-shirts?

I'm looking to find information about getting custom button-down, casual, long sleeve, collared-shirts. I'm a big outdoor enthusiast and I really enjoy my wildlife. Bass pro use to carry repeating wildlife patterns (like deer and elk in the woods) but they don't carry it anymore or if they do, its a hit or miss ordeal. I have came across fabrics that has had patterns I wouldn't mind to be made into a shirt, but making those type of shirts out of that pattern is not my thing nor do I desire to learn how to do that stuff so I was wondering if I could just bring that fabric to a an alterations shop or perhaps any place online that has that service to meet my needs? How much would you expect something like that to cost? I can wear just a regular MED so its not like I need it for a special size, just like the pattern. Thanks for all your help!