You can chart out the letter on knitter's graph paper (see here
for a site that will print it out for your gauge) or you could use one of the charted letters here
I would tend to use duplicate stitch since there are parts of the C that are quite thin (at least in the font used for the H on the sweater) but I'd be interested in what others think. You might try both out with some scrap yarn to see which you prefer.
Have fun with it!