I'm so happy to see this! Target's new Halloween stuff "Hyde And Eek Boutique" now features several new adaptive costumes designed for children with disabilities! There are currently four disability-friendly costumes available and also two wheelchair covers available! According to the online descriptions at Target.com, they were "thoughtfully designed... (for) ease of dressing." They offer a pirate ship and a princess carriage as the wheelchair covers at this time.
Target also offers sensory-friendly unicorn and shark costumes which, according to the website, "features an allover plush construction for a soft and cozy feel" and it also has no tags for added comfort.
More information about the costumes and how to purchase them are online at Target.com