I know where you're coming from! I have lost almost 30lbs and I'm still struggling to see a major change in my clothes. I can still wear most of what I was wearing before, and they don't feel obnoxiously loose. Sadly, I just tried on some of my summer clothes (which I was wearing when I started on WW!) and they don't seem any looser either.
I think I have lost an inch in my waist. An inch after 30lbs! That hardly seems worth it!
But I have had co-workers mention that my pants seem looser. I think it's harder for us to see than for others. I also think my face is thinning out, and my wedding ring fits much better. I think I tend to lose weight from the top down, so that could explain why my pants don't seem that different.
I also have 82 pounds to lose total, so for me to lose 30 pounds is going to look like less of a change than for someone who started with only 30 pounds to lose.
Just hang in there and keep it up! It's gotta show sometime, right?