I have nothing against the pretty designs of CK, far from it as I own several of her dresses (including the one shown above!) I just feel that if you are putting on a "costume drama" of this type & quality it should be true to the era. It certainly cannot be a question of cost as these CK dresses retail at about £80- £90 each and you can still buy a good 40's dress at a vintage or Antique fair for anything between £45 and £75. One may also argue that sizing is tricky, there are ways around this as dresses can be made from vintage patterns using vintage fabric, both of which can be found on the Internet or specialist fairs. Helena Bonham Carter looks to be an average size, but it was she who was wearing the CK dresses, another character called Dorothy wore some great vintage dresses (but appeared to be the larger size of the two women).
Come on BBC costume department, stop being so lazy & get out there to see what is on offer!
Thank you for your comments on this one, I had no idea that there was no longer a "BBC costume dept". What a shame. However it still doesn't excuse the fact that whoever worked on this production took the easy way out.