Depends what you are looking for. I think the big name brands are far too expensive I get all my underwear thongs mini briefs from Ali express. Not had any complaints so far they just can take a long time to arrive.
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Depends what you think is sexy. I always get mine from Ali express. Huge selection from thongs and g-strings to briefs and singlets. Its all pretty reasonable. It may sometimes take a while to be delivered, it's all from China.