I was browsing lulus.com again and noticed they have many dresses similar to that of dresses worn by Blair Waldorf in various episodes. Some are exact replicas I swear and others would give you that same look but in a different way. So, here is what I scoped out.
(clockwise from top left)
1. Summer, Kind of Wonderful - I think we all remember the iconic white Marc by Marc Jacobs dress Blair worn to the all white party. I have to say, this dress by BB Dakota (Joelle) is a spot on replica (minus a few details like the bow on the front). Sadly this dress is sold out on the website.
2. Summer, Kind of Wonderful (again) - Another great dress from this episode was the green floral number. The actual dress is by Milly but I thought this abstract number by Evenstar with a bow detail gave a similar idea but in a different way.
3. The Grandfather - One of my favourite dresses was this really chic mini bandage dress by Herve Leger (Max Azria). It's elegant, but at the same time edgy. The dress I spotted at lulu was by Foxy Lady and it reminded me of the Herve Leger because of the bold use of white against black. I think the layered bodice area draws attention much like the bandage effect.
4. The Dark Night - The flowy yellow dress worn by Blair in this episode is definitely trendy with the dramatic one shoulder. It is a 3.1 Philip Lim I believe, but this one by Likity Split will definitely give a similar look. It also has a fluttered one shoulder detail and comes in a gorgeous bright yellow.