It's time to change your wardrobe. Wearing clothes that are 3 sizes too small is disgusting, no matter what size you are. Buy clothes that fit. Seeing your tits squeezing over the top of your bra is not sexy. Seeing the crack of your ass is not sexy. Seeing the stretch marks on your belly and love handles from the half-dozen kids you have in tow is not sexy.
Guys, same thing goes for you. If you have to pull your pants up all the time, buy a belt, or get them in the right size. If you are a 5' 6" and 120# guy, those 40" pants and XXXL shirts are the WRONG size. Remember, that baggy clothes thing comes from prison, where they don't always have clothes that fit you when you are in-processed. Another note: In prison, when you wear your pants with your chonies showing, it means you're looking to be someone's bitch. Whose bitch do you want to be?
Speaking of kids, how tough is it to make sure that they are in clean clothes with clean faces when you take them out in public. It's not that hard to keep a packet of wipes in your purse with all of the other crap. It's not that hard to make sure that the laundry is actually clean before you put it away. Remember, follow the instructions on the washer, and don't overload it to make sure you get all the dirt out. Soap and bleach are cheap, especially when you go to the 99 cent store to buy it.
Don't look filthy, don't act filthy, and you won't get treated like shit.