Have you seen the Wilton baby clothesline cake:
http://www.wilton.com/idea/Layette-On-Em-Cake
For that one they use the "People" cut outs for the shoe and for the shirt and trim to resemble a onesie. And a small circle cut in half for the baby cap.
http://www.wilton.com/store/site/product.cfm?sku=417-441
If those are not the right size maybe you can borrow the idea and get other cutters for a shirt, sock, etc.
I used mostly circle cutters for the cakes I've done.
The bib is a circle cutter, with a smaller circle cutter for the head-hole. The "bloomers" (or diaper) is the medium circle cutter, with the leg-holes cut with the small circle cutter. I think I must have free-handed (I can't quite remember) the onesie with the small circle cutter for the leg-holes. It's pretty easy to make a dress, too, if it is a girl cake you're making. Just cut a triangle, then cut off the top to make a straight edge. Then use a circle cutter for the neck-line.
Grrr. I can't add the attachment!!! 
I'll keep trying.
I found these after I made my clothes line cake and I cut each piece of clothing by hand.
https://protected.accountsupport.com/cakesbyx/catalog.htm
They are from a fellow cc member Ximenilla. HTH
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