Feastens or Fewstwrs - what's the odd letter or two between friends? However, I, and @lilbill15 definitely bought our knickers in Moldens on the left of the 'arcade'.
Well, I know you didn't mention them but as I recall there wasn't anywhere else in Bedlington you could buy them - unless you had a penchant for the Co-op's navy blue fleecey variety. So, I felt I was safe in assuming such purchases were made at Moldens by your good self as well.
Ninettes, however, doesn't ring any bells with me.