Thanks all for the positives comments !
So the shirt is from SS16, made of Viscose ( not silk unfortunately). You can see it on the runway here:
And the same pattern was used in differents colors and materials for some items in the collection.
The trousers come from an 3 or 4 yo collection, Wool and linen 50/50 blend. Made In Belgium, i bought them irl so i don't have more information sorry.
Those are the border trousers from rugs to riches