The seams of an unlined quilted garment need to be finished neatly.  The best way I know is a Hong Kong binding: Cut bias strips 1 1/4" wide and piece together.  Right sides together, sew to the outside of the cut garment piece in 1/4" seam.  Turn to the lining side and stitch in the ditch from the outside with a short stitch.  Trim the excess bias strip close to the stitching (about 1/8").  Then assemble your garment.  Press seams open.