Why would my friend compare our clothing sizes?

I went shopping with my friend the other day and she bought a few things for herself but I only bought myself a pair of shoes for my holiday. I noticed when we were shopping together she would compare our sizes and say things like “that coat is really nice but it’s a size 8 and won’t fit me. It will fit you though you should buy it”. And then when I found something I quite liked she would ask me if she could try it on and then she would get it for herself.

Why would she compare our clothing sizes?

Why would my friend compare our clothing sizes?
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