Sweet Siblings Princess Estelle and Prince Oscar Pal Around for Sweden's National Day
The scene-stealing 6-year-old daughter of Crown Princess Victoria and Prince Daniel is pictured wearing a traditional Swedish national dress in white, yellow and blue — the latter two colors appear on the country's flag. However, Estelle is too young to wear the hat, known as a Sverigedräkten, which is also part of the costume. The head scarf is only worn by Swedish princesses once they're married. Therefore, Estelle's mom Victoria is permitted to wear one, as are Princess Madeleine, Princess Sofia, and of course, Queen Silvia.
Estelle's 2-year-old brother Oscar donned a simple yet classic crisp white button down shirt and dark blue shorts for Sweden's annual national day on Wednesday.
Sweden began officially celebrating the holiday on June 6 in 1983 to commemorate the day Gustav Vasa was crowned king in 1523, as well as the day a new constitution was adopted in 1809. Arthur Hazelius, the founder of Skansen, Stockholm's open-air museum, first suggested the idea for national day and started celebrating there as early as the 1890s.
- Want to keep up on the latest from PEOPLE? Sign up for our daily newsletter to get our best stories of the day delivered straight to your inbox.
Now each year the king and queen partake in a ceremony at the museum, during which the Swedish flag is run up the mast and children in traditional costumes present the couple with bouquets of summer flowers.