Treble Brussels stitch
Treble Brussels stitch is a needlelace stitch, consisting of detached butthonhole stitches worked over a pre-existing outline. It is similar to Double Brussels Stitch, but three buttonhole stitches are worked instead of two. For Treble Brussels stitch, you might find it easier if you use a finer thread, for example a twisted silk.
Treble Brussels stitch is attached to the background fabric only at the edges. In the example below, a simple back stitch outline is used, but this could be a cordonnet when making a needlelace slip.
For more background see the entry for single Brussels stitch.
Work three buttonhole stitches in the top left-hand corner of the shape as you worked two buttonhole stitches for Double Brussels Stitch.
Leave a gap between the two triple buttonhole stitches and repeat along the row across the top of the shape. Attach the stitch to the right-hand side of the shape by whipping the edge.
Whip the right-hand side edge again to bring the needle just below the first row.
Work from right to left and start the second row by working three buttonhole stitches into the last loop of the first row. Continue to work three buttonhole stitches in each of the large loops of the previous row.
Work to the left-hand side edge of the shape, and pass the needle through the left-hand side edge.
Whip down the left-hand side edge to bring the needle just below the previous row.
Continue working backwards and forwards across the shape. On the final row, take the needle through the loop above and the bottom outer edge as you form each buttonhole stitch.
A completed treble Brussels stitch
Structure of stitch
Identifying Treble Brussels stitch
A woven stitch using buttonhole stitch in rows to fill a shape. Three buttonhole stitches are worked into the loop of each alternate stitch above on the previous row.
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.227