Not a silly question at all! I asked my neighbor if she had any onesies that her baby had grown out of, probably the silliest question she had ever had! Coral was about 12 lbs at the time I needed to have a covering to help a surgery incision heal. It was close to her neck. My neighbor had a size for an 18 month old so the only alteration I had to make was to sew up the neck so she couldn't get at her skin issue on her shoulder. I just left the snaps open and she had no problem using her box. The other option I used was an elizabethan collar that I made out of cardboard and used string to thread through holes I had punched at the closing so it was easy to get in and out of.
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I found that WalMart had the least expensive onesies and some were on "sale." The other option may be to look into a thrift store. This worked well for Coral and she healed and has no "scar" lack of fur in the area. Best to you, Kathe