My Best Friend's Ex-Boyfriend

Today my awesome neighbor, friend, running buddy, hair artist extraordinaire, brought over a tote of clothes she was going to send to DI (non-Utahans think: thrift store, Salvation Army.) She does this periodically when she goes through her wardrobe because she knows I am helpless when it comes to clothes, that I am pretty stingy when it comes to spending any kind of money on myself, and because she rocks. I found a few nice shirts and jeans to supplement my closet and will take the rest to DI. This neighbor has style and always looks cute and classy, so the clothes I get from her are unfailingly cute. Pluses all around. However, because I am neurotic, I feel like I need a mourning period before I put on the clothes and wear them as my own. Although I have never dated a best friend's ex-boyfriend before, I imagine this is what it feels like. For the first few times that I wear one of these articles of clothing and receive a compliment on it, I feel like I need to explain, "Yeah, I know it's super cute. It's my neighbor's. She didn't want it anymore and let me pick what I wanted before she donated the rest." Then after a I've had the clothes for a while, I don't need to explain anymore and they become mine. Is that weird? I have a few things she gave me last year that I haven't worn yet because the mourning period is not quite over yet. Yes, it sounds strange, but imagine you've just started dating your best friend's ex-boyfriend, and you may understand how I feel.