Kimono sleeve nightgown with flare

Prepare the draft of the kimono sleeve nightgown as explained HERE.

The portion of the draft which is above the line C-J is body and the portion which is below the line C-J is skirt portion.

Divide the skirt portion in to three portions by drawing lines P-Q and R-S.( Figure 1).

Cut the skirt portion along the lines in the direction Q-P and S-R till the points P and R and do not separate. (Figure 2)

Cut along the line C-J and separate skit portion from the body portion.( Figure 3)

Spread the skirt portion as shown in the figure 4 on another sheet of paper and secure them with pins.
If you want more flare you can spread them more.

Figure 4

Draw out line of the shape thus formed as shown by dotted lines. Cut the shape out. This is the new flared skirt portion. Figure 5.

Figure 5

Same  draft is used for the back skirt portion of the nightgown.
Body portion is different.While cutting the fabric an extra 1/2" is added along the lines C-J of the body as well as  to the top portion of the skirt .This is for seams.

Attach skirt body and proceed as explained HERE.
Stitch a belt of contrast colour and secure it to the middle  near the waist line at the back.