Congrats! I too have the same struggle. I gained 75#, and stayed "comfortably thick" for quite a while after I had my son. I have been losing for the past year and a 1/2, and I have the same issue. Mine is predominantly on my belly. I have done lots of reading, and have a few points I hope will help.
Drink Lots of Water to keep you hydrated from the inside.
Keep healthy- Eating, workouts, Low salt, adequate Protein, no smoking
Keep your skin moisturized from the outside- I use St. Ives Skin Firming Lotion. It helps your skin feel hydrated, without a heavy, greasy feel. I can't prove it meets up to the claims of "Skin Firming", but I noticed a difference in the quality of my skin. And it's not expensive at all! I use it about 3 minutes after I towel dry from a shower. I love it!
Try Fish Oil supplements. I just started taking them not too long ago, so I can't make a claim either way, but it is supposed to help for various reasons.
Some people have more elastisity in their skin, and some have less. It will take time to go back, and it may never go back to perfect. But don't focus on the minor imperfections that you see. Think about the great accomplishments you made! You look great!
For more tips visit: http://www.antiagingsolution.org/blog/how-to-tighten-loose-skin-after-weight-loss