You can find made to measure shirts on following addresses:
https://www.cafecostume.com/
http://thesuitlab.be
https://oxford.be
https://www.gillo.be/
http://www.ruben-o.com/
http://www.albert.be
https://www.guy-david.net
http://merlet.be/
https://www.mercken.com

You can find bespoke shirts at exclusive retailers in Antwerp. For the choice of fabrics, the style options and the measurement, you should go on site. Antwerp offers tailor-made clothing, tailored shirts and tailored suits.

Shirts made to measure are also available online at Bivolino.com

From the Collection https://www.bivolino.com/en/made-to-measure-shirts