First of all, shoes.
Second, I totally understand. I have been a bridesmaid three times, and I only ever put my foot down about one thing: those stupid matching wraps that are so goddamn tacky and unimaginative I just want to cry. I've paid to have my hair done, makeup done, I have three dresses hanging up that I actually do wear but cost me about $650 all together, and have spent thousands on plane tickets, lunches, drinks, lingerie and housewares for assorted bridey-type functions. It's a pain in the ***.
Third, I've recently been a bride in the full, frilly sense of the word. I love my sister to death, but she was stressed out for most of the period leading up to my wedding and it made me feel really guilty about even asking her if she had bought a dress. When she did, she complained about the cost of it, the cost of the shoes, and I felt awful because she picked them all out with no stipulation. She came through in the end, but she was worn out and ready for it to be over, and I could tell. The fact that my sister-in-law smilingly and sympathetically did everything I asked for and then some (spending beaucoup bucks on both a tiny tux for her son, a full-size tux for her hubby and dresses for her daughter and herself, paying for my honeymoon hotels, coming from VA for my shower and always understanding that no matter how high-strung and insane she felt with the entire thing I was ten times worse) elevated her to sainthood in my book. I knew she would rather not have done it, but her attitude spoke volumes about her love for me and her care for my state of mind. She was efficient and reliable and fantastic, and I will have that memory all my life.