i would do a large meandering across it- remember with minkee to lengthen your stitch length- and baste very very well- it is stretchy- you need to smooth-without stretching.
an all over edge to edge meandering would work well- as for color----the thread will pretty much disappear in the minkee (sink in) i would use a medium gray or cream which tends to blend in well with most fabrics instead of standing out.