How to naturally refer to twin sisters?

Hello, everyone! I am a student who has been self-studying Korean for over a year. I'm not perfect yet, but I have developed a lot of curiosity about Korean culture. In particular, I have a twin sister, and I am wondering how to naturally refer to her in Korean. I am a girl, and my twin is also a girl. So, I am contemplating whether to call her '쌍둥이 언니', '쌍둥이 자매', or simply '쌍둥이'. In Korea, the titles used can vary depending on the other person's age or situation. If one of the twins was born first, it is common to use '언니' or '동생' based on that order. If the twin sisters are the same age, it can also be natural to just call each other '쌍둥이'. Additionally, in some situations, it is possible to call each other by name with '언니' or '동생' attached. For example, you could say '민지 언니' or '수지 동생'. These titles help to create a closer relationship with the other person. I would appreciate it if you could share your various opinions or experiences!