Hi Judy,
25a - It has loose definition so I understand your difficulty - the answer is a specific object.
3 letter "very" then half of "thin"/evenly-dividied + 4 letter "dress" as in 'groom', 'untangle' etc. - definition is "it's fine, ( so they say now" although, to be honest, I don't really understand the purpose of the inclusion of "so they say now".