It took me 40 lbs before anyone other than hubby noticed (I didn't even go down a stupid size!). Now that I've lost 80, every 5 lbs is noticeable, even to me, and especially in clothing (though it's a slower rate of loss now).
Don't give up. I always sabotaged at around 30 lbs because I was like "screw this, I'm working this hard and it makes no difference". I also second the idea to take pictures. I started taking one every 10-20 lbs. I didn't LIKE what I saw in the loss pictures either, but I could still tell a difference, even when looking in the mirror I could see nothing.
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