Passing varibel to jquery selector

I know there is tons of answer over this questions. And all answers are the same. I want to pass a variable to a selector. For example

var item = 'size_';
$("input[name="+item+"]").change(function () {
     console.log('got it');
});

Lets say

== M, So the var item ='size_M'

This far the code is doing ok. There is no problem in item variable. But in the selector instead of getting size_M it's getting the item string it self.

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