Try a tailor or a dressmaker. If it's an antique, leave it alone because the value will drop significantly if it is altered. If it's just an old favorite stuffed toy whose only value is sentimental, then you could always go to a cloth shop and peruse the pattern books.
Those of us who watch Antiques Roadshow know you shouldn't try to fix up a possible antique before you get a professional opinion on its value as is. If the toy is old and/or collectible, it might be worth more just the way it is. Just a thought.
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