For the 2015 Nobel events, Princess Madeleine wore a custom Fadi el Khoury creation for the Nobel Prize Ceremony and an Alberta Ferretti dress from the Pre-Fall 2015 collection for the King's dinner for the Nobel Laureates. 

The Nobel Prize Ceremony was first and took place on November 10, 2015, in Stockholm. Princess Madeleine wore a gorgeous grey custom Fadi el Khoury (one of my favorite gowns of hers ever). The gown, with a hint of glitter throughout, featured buttons down the front and sheer long sleeves. She wore her aunt, Princess Margaretha's Aquamarine Kokoshnik Tiara that perfectly matched her blue eyes. Madeleine carried a grey Jimmy Choo clutch and wore Queen Silvia’s diamond flower earrings and the aquamarine ring that Princess Lilian left her upon her death in 2013.

Note: This gown was worn in an official photo released by the Court and again (tiara and all) by Madeleine for a "fairytale tea party" at Stockholm Palace for children dealing with serious illnesses in coordination with her patronage Min Stora Dag (My Big Day) which is the Swedish version of the Make-a-Wish Foundation. 

Queen Silvia was in a red gown with the 9 Prong Tiara. Crown Princess Victoria wore a By Malina violet gown specially made Aubergine Silk Chiffon Gown and Cape while carrying a pink Bottega Veneta clutch. She wore the Connaught Tiara.

Princess Sofia was in a navy Oscar de la Renta gown with a matching clutch. Sofia also wore her wedding tiara. 

For the King's dinner for the Nobel Laureates at Stockholm Palace, Madeleine chose a dark grey Alberta Ferretti gown that featured a high collar and lace detailing. The Princess wore the Modern Fringe Tiara and carried a black Bottega Veneta clutch. 

Her mother was in a still to be identified gown; her sister was in a navy sequined Pär Engsheden gown that she had previously worn while pregnant with Princess Estelle in 2011. She wore the Baden Fringe Tiara and carried a dark Alexander McQueen clutch. Madeleine's sister-in-law was in a custom made couture dress from Zetterberg Couture which is slightly reminiscent of Madeleine's Nobel gown with the lace and button detailing. It would also be a gown she wore in an official photo. She was in her wedding tiara and carrying a Mango clutch.

The Nobels went as follows:

Physics: Takaaki Kajita and Arthur B. McDonald

Chemistry: Tomas Lindahl, Paul Modrich and Aziz Sancar

Physiology or Medicine: William C. Campbell, Satoshi Ōmura, and Youyou Tu

Literature: Svetlana Alexievich

The awards were presented by King Carl XVI Gustaf in the Concert Hall. The banquet was held afterward at Stockholm City Hall. 

Nobel prizes are always handed out on December 10 - the day Alfred Nobel died - in his memory.