My seams are not 1/8", they are 1/4" for piecing the block pattern together. I have 1/2" seams for sewing the individual blocks together. The 1/8" is the measure from where the blocks are sewn together. It is just quilted 1/8" from that seam so it will lay flat. I agree a 1/8" seam allowance would not hold up to even everyday use, let alone washings.