So I called my FI SIL and told her about a flower girl dress for her daughter that was on sale for an amazing price. I asked if it was ok if I picked it up now since they live in Eastern WA and they don't have the store where the dress is at close to them. She said yes and that the price was good. Well this last weekend my FI and I went over there for a visit and to have our niece try on her dress. When she was trying it on and we were talking about the amazing deal she did not mention once about repaying even though she said she would.
Normally we don't mind paying for things but she knows we're on a tight budget since we're footing most of the bill for our wedding. How do I go about asking for her to pay for the dress? Is it ok to ask for the dress back after the wedding? I would hate to take my nieces "princess" dress away but my FI and I are really tired of his SIL and brother always getting out of having to pay for things. They're huge tight wads and have no reason to be. I don't want any family drama so I need some advice on how to go about this politely? Any advice would be helpful!