Sometimes it is just easier to let this battle lie and build the ground work for the next one. Let your fiance do what he wants and buy the shoes. (This is up to you, I tend to get stubborn about these things but it doesn't really do me many favors in the end). But you two need to have a discussion about what you are willing to provide for SD now that she is starting college. She is old enough to get a job so I would say that if you two agreed she can pay for anything beyond basics and necessities herself. So you provide accommodation, food at home (she can make her lunch for college and take it with her), a basic wardrobe of clothes and possibly transport costs to college and basic stationary. She should be contributing towards the phone bill (if not all of it) and then any spending money she wants to socialize or if she wants any extra clothes she can earn some money and buy them herself. If your husband wants to spoil her then he can wait till her birthday or chirstmas, if you can afford it. If your husband objects that it is too harsh then maybe suggests she have a nominal amount of pocket money (40 a month?) so that she has some cash on her.

Yes she sounds spoiled and it sounds like she needs to start learning how to earn her own money and that no one owes her anything. How far you get with teaching her these lessons depends if your husband agrees and is willing to force her to learn them. If he isn't then don't dwell on it for now. Arranging a wedding is stressful enough without stressing about a new pair of shoes for SD. The situation will arise again in the future and you can try to tackle it then.