Should i add sleeves?

I have always wanted long sleeves on my wedding dress and picked a winter wedding so that I could wear sleeves comfortably. the dress I picked only has capped sleeves, but they told me they could add sleeves if I wanted to. I initially said no because I didn’t feel comfortable ordering a dress not knowing what the finished product would look like. Well the designer just released his new collection and there is this one dress with a top just like mine and sleeves and it’s so gorgeous. I want to call and ask if it’s too late to add sleeves but now Im worried that the sleeves will clash with the cape that I’m wearing and if I add sleeves there’s no going back and I already ordered the cape. Should I risk it and get sleeves or just stick with the capped sleeves I have now??