New Supergirl Costumes by Rubie’s
Rubie’s Costumes now includes adult and child-sized Supergirl costumes based on the TV costume. Get your red seams and thumb-hole sleeves here!
They also make DC Super Hero Girls costumes and wigs, and a very cute tutu costume (yes, there’s an adult-size tutu skirt too). The full range of Rubie’s Supergirl items appears to be available on Amazon.com and a number of its international sites.
Note: The boot tops from Rubie’s previous Supergirl costumes are no longer included, probably due to customer dissatisfaction with their low quality and narrow size range. You can purchase the boot tops separately, but…read the customer reviews first. There’s a reason so many people DIY their own boots (for example, this Supergirl spandex boot tutorial).