Before you buy at the flea market, consignment shop or vintage specialty shop: If it’s too small, skip it. Too large? Bring it in for alterations. Check for holes, loose seams, old stains or beads falling off. Check clasps, buttons, zippers. Learn to bargain, gently. Start with “can you do a little better on this?” and be ready to offer a dollar amount. Cash talks louder than credit cards when you’re bargaining. Whatever you find, bring it in for a professional cleaning.