The outfit that she's wearing is the average scouts uniform. With Belgium having the highest percentage of youth being a member of scouts, their presence in society and in any city is unmistakable.
https://en.wikipedia.org/wiki/Scouting_and_Guiding_in_Belgium

Her skirt is covered in 'kentekens'
https://www.scoutsengidsenvlaanderen.be/over-scouts-en-gidsen-vlaanderen/uniform/waar-horen-de-kentekens

In her pocket there is a mobib chipcard, used to hold tickets of subscruptions of the NMBS/SNCB (national train company), MIVB (the public transit company in Brussels), and the national bus companies (de Lijn, TEC)
https://mobib.be/nl.html

The beer bottle is any of the 'kriek' cherry beers.
https://en.wikipedia.org/wiki/Kriek_lambic

The sheep patch is a crop of the famous Ghent Altarpiece painting 'Adoration of the Mystic Lamb'
https://en.wikipedia.org/wiki/Ghent_Altarpiece#Adoration_of_the_Mystic_Lamb