Yes, you can use hack object called Insimenator, buy a pack of clothes in electronic and choose "Buy new outfit" from menu. Just be careful, using this tool mindlessly can cause serious problems!
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I have the Sims 2 so this answer may differ, but try anyways. For Sims 2, you can call a taxi to take you to a community lot with clothes for sale. It will usually say in description. Then, when you get there, you just click on a clothes rack and start shopping!
You have to call a taxi and go downtown or to your neighborhood shopping district. Then when you get there, click on one of the clothes rack and click "Buy..." then you can choose some clothes to buy
you have to save and quit then go on continue at menu then you can change sims clothes
You can probably get clothes from the Sims 3 website with real money, or download the sims that people make
You can get newborn clothes on the sims 3 or sims 2 by going on a downloading site that you can download for free for example thesimsresource.com gots a bunch of stuff for free they also got some newborn clothes if don't like those try to search it up on google and it will somtimes give you websites that has this item