Work wardrobe crisis - help

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I go back to work next full time but literally none of my old work clothes fit. I was a curvy size 14 before but am now a sagging in all the wrong places, frumpy 18 on the bottom, 20 on the top. My legs are still slim but thanks to 2 babies with a 14 month age gap I have a hideous kangaroo pouch tummy & big saggy boobs.

Where can I get flattering, inexpensive work clothes from? Any style tips would be appreciated to.

A woman I used to work with used to wear a lot of dresses from Peacocks. They were ridiculously cheap and looked very nice. I would get several of them in different styles and wear them with cardigans - short sleeved cardies for summer and long sleeved cardies and thick tights in winter.