Don't use much bleach unless you have to. Bleach can be potentially harmful to the fabric (as it is a very potent substance), and if you use bleach, you only need a pinch or two, even for the jumpsuit. Remember, it's not a full load, and you also don't want to overbleach. You might end up with a way too light, uneven suit that may or may not have weakened or loose thread.
What I would do first is use a packet of RIT Color Remover each wash until you get the lightness you want. If the material doesn't take the Color Remover well (and it might not, if it is polyester or a cotton/poly-blend), then resort to a pinch or two of bleach. Once you get the right lightness, then use the light blue (or equivalent) RIT dye (I recommend the liquid that comes in a bottle), and use increments until you get the right color (keeping in mind that it will always dry lighter). You might also want to keep some gray RIT dye on hand in case you need more gray in the suit as you go. Whatever material the jumpsuit is, it will take the dye, but some fabrics take it faster or slower than others. I recommend putting the suit in the wash with half-a-cap of RIT or so, and then hand-stirring in a basin and adding dye accordingly until the correct color is reached. Try not to let the suit soak in the dye without getting stirred, because the dye will separate from the water, and you won't get an even dye.
Above all, though, I would recommend trying this process on a sample of the same fabric first, if possible. Hope this helps.