What he said...at least for most scenes. And the "crease" that can be seen looks to me like a rendering error, similar in effect to how in some video games you can walk up to a wall and rotate the camera "into" the wall so you can view yourself partly in it. It's not "supposed" to look like that, but the way the rendering engine or ray tracer roughed it out (And I'm sure it was probably a really quick render) or the way the faces or surfaces intersected created a slight distortion. In quick renders, stuff like that, especially on shiny surfaces, is very common.
And to anyone complaining that Robo hasn't made thigh extensions: Who cares?! He gave us an ENTIRE IRON MAN SUIT...FOR FREE. Thigh extensions weren't even something that anyone considered until DancingFool released them, and while they are a fine piece to add to a costume, they just make it more cumbersome and difficult to move in. If you really want them, use a little creativity, they're not complex pieces, try freehanding them. A little creativity goes a long way to making the project your own.
...and to be completely honest, I don't know why anyone could complain about it, I haven't seen many people around here far enough along in their build progress to even worry about something as small as thigh extensions. Build the rest of it, and if you still want them, the experience you gained in building the rest of the suit will make it that much easier for you to do it for yourself.
I only wish I wasn't so broke right now so I could donate to you, Robo to let you know how much I truly appreciate all of the hard work you've put into this. Fantastic work, fantastic tenacity, and just a fantastic project to share with all of us. Thanks!
-Nick