Great work on these capes! Something to add for anyone interested in crafting capes for their armies. When it comes to keeping the fabric from fraying and giving it that nice, crisp feel we've come to know and love from our official Lego capes, I recommend a product called 'Aleene's Stiffen Quick', which can also be picked up at your local Jo-Ann Fabrics store (don't forget those coupons! 40% off will save you a couple extra bucks!) -- it's a spray, and I usually get a good yield of capes per bottle.
The trick is to give it a few coats - Spray the fabric well, let it air dry, blow dry it, iron it, however you feel comfortable drying it, then add another coat or two. It's a great product. c:
As far as printing on capes goes, I'm uncertain if a laser printer would be suitable for fabric. From my limited use of laser printers, I feel as though the ink is more like a film than a dye or liquid like with inkjets, so I'm not sure how that would work on cloth. But hey, who knows till you try it out!