The tag alias #80658 onesie_undone -> onesie_open has been rejected.
Reason: These seem to mean the same thing; in the case of snaps or buttons "undone" might be more specific, while "open" also seems to include zippers. onesie_open is the more popular tag.
EDIT: The tag alias onesie_undone -> onesie_open (forum #471950) has been rejected by @imfac.
EDIT: Rejected my own alias because I found out that open_onesie is even more popular. Made a BUR (forum #471952)
Updated