Saw a tumblr post where someone thought that Charming’s sleeve in the Rapunzel pic looked like his sleeve in the S3B BTS pics. I looked up a clearer pic and Photoshopped this side by side…
Don’t look quite matchy to me, (the Rapunzel one seems to have gold studs too, and the lines look wider spaced), so I don’t think we can say for sure that the Rapunzel stuff is in the missing year, (can’t rule it out either). I haven’t gone looking up screencaps of all of Charming’s flashbacks to see if the Rapunzel scene costume matches anything that might help us place it on the t-word.