Dyeing wool suit for 10th Doctor question

I have a dark brown with beige pin stripe wool and cashmere suit. I of course want to get my beige stripes to blue. I have experience dyeing fabrics, and normally when dyeing wool it is only done with fabric before cutting for a costume since wool fabric shrinks so much in a hot water dye bath.

The problem here however, is I cannot have the wool shrink since it is already a suit, and I am looking for an adequate method for getting my beige stripes blue without the use of hot water. Has anyone had any luck dyeing wool in a pre-made garment? I was considering painting the stripes individually by hand, but the dye generally has to be mixed to a paste and am concerned that the finished product will not look right as any blue dye paste on the dark brown will cause a slightly different shade then the rest of the dark brown.

Any suggestions for achieving my blue stripes on my brown wool pinstripe suit?

I would go to a fabric store and find a fabric marker. With that and a straight edge, you should be able to color over the beige pinstripes.

You cannot use a dye bath as not only will the wool shrink, but the interlining, facings, lining and shoulder pads may be adversely affected.

Lynn