Don't apologize for posting- that's what message boards are for!
What are your sizing options? Usually it will be by inches ( 10, 12, 14 etc) and that equals the inches around their chest. My current favorite harnesses are made by a YT member, Chattiesmom. She makes fabulous silk harnesses. Welcome to YT!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226