Suitsupply is a Dutch brand, which was established in 2000. Suitsupply pocket squares are usually produced in Italy. The brand uses silk, wool, wool+silk, linen, linen+silk, cotton+silk and cotton fabrics (in my opinion, their quality is above average but not excellent). The size is quite small: about 29*29 – 33*33 cm. (you can read a detailed article about pocket square sizes here). These pocket squares feature machine-rolled edges. The edges of the cheapest pocket squares are stitched by ordinary machines.
The range of Suitsupply pocket squares is quite wide. Patterns: houndstooth, medallion, fancy and abstract patterns. Besides, there are plain pocket squares with contrast edges (and without contrast edges as well). Colours: blue, navy, white, burgundy, grey, brown, red, orange, green, rust, etc.
You can buy Suitsupply pocket squares in Suitsupply stores or at Suitsupply.com. Prices start at 10 EUR, usually at 29 EUR (incl. VAT). The brand does not run sales.