I think it has all been said but coming late to your post I had to comment.

I think most of us have days like this. And I do believe we are always our most harsh critic. I think you look fabulous in both pairs of pants. They do not look leg shortening to me and the heels look great with them. They fit well and are very flattering. I think they also fit the "look" you like. The "faults" that you see, trust me no one else sees them. I see a gorgeous woman, who knows what looks good on her, and IMO ALWAYS looks fab.

Please wear and enjoy the pants, they, and you, look amazing.

It would never cross my mind to say that you have big/strong thighs.Yourbody seems very proportioned to me.In fact one of these days while trying colored jeans I was thinking about you and wishing I had your figure(sorry for taking you to the fitting room;) )
I understand your frustration though.From all the muscles on my body my thigh ones only have to be whispered the word exercise to start swelling.
It is difficult when there is a false idea of beauty going on in the world.But you are beautiful,can rock those cigarette pants and dazzle the world with your gamine style.

Naz, I have to chime in also with reassurance that you look terrific, and I never would think your thighs would be an issue to look at you. BUT, I also am extremely conscious of the size of my own thighs (even when I was a teenager and all of 115 lbs), while other people have said they're not out of proportion, so I truly do understand how you feel.

Oh, and I also have a little frustration that all the running I do does not decrease the size of my thighs much -- but the are more toned than they used to be! Always trying to look on the bright side, hehe.

I think those pants look wonderful on you! I don't see stumpifying at all -- I see mod cool!