Dying Fabric???? Particularly Terrycloth.

I've heard good things about Dylon dyes (I think you can get them at Michael's or Hobby Lobby). Personally I use Procion dyes since I dye and sell clothing, but for home use that's probably more investment than you'd be looking to make for a one-time thing (the dye is not very cheap and then you need soda ash as an activator and salt is useful too, especially for dark colors). If you did want to look into Procion dyes, the two suppliers I use are http://dharmatrading.com/ and http://www.prochemicalanddye.com/

It could be the fabrics. Some fabrics are just plain resistant to dyes. I have found that synthetics seem to take the color better than natural fabrics. You may have to over dye, or redye to get a darker color.

The only way the fabric you are dying will look like what you expected it to is if the fabric was white. Going from one color to another is not totally doable. Like red + yellow = orange, color A + color B = color C. Hope you find something you like, even if it's not quite what you expected.

I know that I have heard of another kind of dye that works better. But I've searched the message board where I first heard of it, but no luck.

I did find some info on Low Water Immersion (LWI), which seems to work great. There's a crafter on Etsy.com who did it and dyed fabric solid colors and it looks great.

Maybe it's Procion MX. Found info on this site: http://www.pburch.net/dyeing/lowwaterimmersion.shtml

Is there a label on your jogging suits? If the terrycloth is a natural fabric ie: 100 percent cotton, you would need a different type of dye, the kind you'd get at Dick Blick's or another artists supply store. If it is cotton/poly blend as I suspect it might be, the RIT should've worked.

But one thing that ruins the absorbency of dyes is fabric softener, so if you decide to re-dye them, wash them first without any fabric softener, and perhaps even with some vinegar or other astringent to strip any coating from the fabric as a preparation for dying. Fabric softener actually coats fabric, and that keeps dyes away, that is why if you ever do tie dying or other dying, you pre-wash the fabrics, the companies add starch & other goodies to make their products look their best in packaging and that prevents dye from reaching the materials.

A recent article I read in a quilting artist magazine said that RIT is actually good dye, particularly for synthetic fabrics, which aren't able to be easily died with artists' dyes. My son used to use it to dye his favorite t-shirts after they were stained. It worked great for that and lasted a while.

I hope all that helps you.
Good luck!
D.