Fellow Robin enthusiast namii06 created this amazing Nightwing polo shirt and couple of Robin t-shirts, and they were just too good not to share. She created the designs out of heat press transfer vinyl (a nifty tutorial can be found HERE) and intends on creating shirts based on the designs of Red Robin, Batman, Superman, Superboy, the combined Batman-Superman symbol, and many more, so be sure to check out her Tumblr!
Unfortunately, she doesn’t appear to be selling any of her shirts, however I reckon that you could create a similar Nightwing shirt by screenprinting a black shirt with opaque blue ink; you could print this design on a standard t-shirt or a polo shirt like namii06, however I think that this design would look stellar on a deep black v-neck. Likewise, you could easily recreate the Robin shirts by printing the Robin emblem on printable iron-on transfer paper for colored fabrics.
And for those of you who don’t fancy arts and crafts, I suppose you could just order a Nightwing shirt (note: this design is based off of the Animated Series costume) and a Robin shirt from Graphitti Designs instead ;)
Regardless, I figured that this could serve as a little styling inspiration for the upcoming Robin Tumblr meetup ;D