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It's not so much that you have to buy giant baggy pants for IWB, as it is that your jeans need to have a little extra in the waist. With OWB your shirts have to be a little roomy. Try sticking a bar of bath soap in your waist band, that's about how thick a G26 with a holster is. Your pants can't be too tight or you will be uncomfortable all day. Glocks aren't the thinnest of guns, if you are completly unwilling to make some sort of compromise in dress, you may find it tough to carry.

I too am in the 5'8" 180 lb range, and carry a g27 daily. I carry IWB at about the 3:00 position in a comp-tac undercover holster. You have to make sure to buy pants that are size bigger than you would normally wear, and invest in a good belt. I wear t-shirts most of the time with no problem, although dark colors seem to print less. A under shirt tucked in between your gun and your skin can help with comfort.