Cheapsmells.com are brilliant for perfume at very good discounts and they have a great range to choose from.
I've been using Revlon Colourstay foundation (£12ish) ever since my Prescriptives colour got discontinued and am so impressed I didn't bother to buy a fancy one for my wedding.
Grey Converse can be found at discount at amazon - wasn't sure which ones you wanted.
No suggestions for coats I'm afraid. I've never managed to find one I really love.
Buy the dress you mentioned if you love it or you'll regret not getting it when you had the chance.
...The bag isn't cheap but it's a classic style in black leather so it would be an investment - and the discount on it is impressive. You'd feel amazing having a really nice bag and a bonus is a chance to get it.
I've got time on my hands today as you can tell. I'm trapped under a sleeping post-jabs baby with only the laptop within reach . Happy shopping.