I'd second and third all of the above and add that I don't necessarily think that modeling is something that everyone is ever going to be real comfortable with. Like most things if you put enough time and sweat into it you can accomplish something but I'm pretty convinced that some people just don't have the brain wiring to see and intuitively think in 3D space and for them, it's always going to be a struggle. That's not to say it can't be done, but it may be more than one is willing to invest. If that's true then you might be better off concentrating on other aspects of 3D--just my opinion. Having said that, it's quite possible that any of the other things mentioned are the main problem, trying to do too much too soon, not finding the "right" program, just needing a break, etc. If you're determined to do clothing, then perhaps try modifying some existing items or start with simple(er) things like hats or shoes. Above all, don't give up. When you hit a wall in learning anything, the best thing to do is often to just let it go for a while. You may have run yourself into a rut. A lot of times, coming back later will allow you to find a new insight you were missing before. You may have to do that more than once but you will make progress--though it may not be as fast as you'd like :-)

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken