How to talk about this to a girl?

I really like when girls wear sneakers (sports brands).
I would like talk about it with the girls (chat or in real life) without this appearing a strange or fetishistic speech (I’m not interested in sniffing or licking them).
It can be something useful as a topic of conversation (and fashion advice) but also in case she wants to dress up knowing what I like and... how to attract me.

How to talk about this to a girl?
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