Oh yes, I totally agree that Alice would spend lots of money on designer clothes for everyone! Having a Black Card
(if Bella has one, of course Alice does too!), why wouldn't you spend some money on great clothes? Especially if it is your craving!
In the vampire world, people would remember what you wear for centuries, and you wouldn't want to be caught on an ugly attire! No way!
I think Alice owns several pairs of expensive Manolos (maybe even Bella's shoes from her transformation were designed by him!) and ALL of her clothes are designer ones. I think she did some online and phone ordering for Bella's wedding gown, so that is probably part of her modus operandi as well.
With such fast driving, it wouldn't take her too long to get to those nice designer stores in California, and when they're off traveling, Europe is definitely home for fashion!
Also, I don't think Alice would repeat a dress or gown, no way! And she doesn't seem like a department store shopper, nah nah!