As I'm in the UK I am unable to suggest any shops but think the following items would be of great benefit to your accessory wardrobe:
1) Scarves - I would opt for a rectangular scarf which are easier to tie and create a slimming vertical line when worn. I would choose a solid bright one to wear over printed tops and dresses and a patterned one to wear over solid tops and dresses.
2) Belts -I would choose one slimline belt to thread through belt loops and one wider waist cincher.
3) Necklaces - I would buy one shorter length necklace (the length of Angie's in the TV interview) to peak through the collar of a shirt or blouse, plus one long necklace, possibly pearls, which could be worn as is over tops and dresses or wrapped to give further options.
4) Pins and brooches - if flower pins are your thing, Danja picked hers up at H&M.
This is only my opinion Medusa, just remember to pick up the pieces that you love and you will not go far wrong. Do others agree with my post?