|In making a white silk charmeuse dress, I employed underlining to eliminate seam allowance show through and reduce wrinkling. Following the tips on Threads I cut the white charmeuse outer fabric and red silk habotai underlining from same pattern pieces. Next I pinned the fabric and underlining together down the center, along the straight grain. Finally, to adjust for the amount of space taken up by fabric's thickness when folded, I folded the fabric in half over the pins. At this point the underlining extended past the outher fabric, so I hand basted near the edge of the fabric around the perimeter of each pattern piece. All that remained was trimming the excess underlining, which I did after sewing the first step of my french seams (wrong sides together).