Women...I shouldn't have to tell you this. As a red blooded male, if i walked into a florist shop looking to buy flowers and was greeted by a really hot looking girl, smartly dressed etc, etc, I would be very reluctant to appear tight fisted and go for the cheapest flowers. I would want to create an impression even if there was no intention whatsoever of trying to chat you up.
It's just the way us blokes are. So whatever you spend on smart clothes, you will probably get back time and time again!