Can 'uma luva' mean a pair of gloves, in the same way that 'uma bota' can mean a pair of boots?
Você tem/alguma uma luva pra me emprestar? = Do you have a/any pair of gloves to lend me?
Você me empresta um sapato? = Can I borrow you a pair of shoes?
Lady is a difficult word in AmE. You can't address a woman directly "lady" because it sounds rude, and it can sound rather old fashioned to refer to women as "ladies". It is still used on the doors of public toilets and in a fixed expression like "Ladies and Gentlemen".
In English, "lady" was used as the female version of a "lord," but today it can be used as "woman." However, in some contexts, it retains some of it's "class." Ex: "I'm not just another woman; I'm a lady." When a person says this, she's saying she deserves to be treated with respect. Also, "Lady" is a term used for nobility.