You don't think you need three sizes until you have corsets in three sizes. The extra sizes mean each shirt is exactly the size it needs. You need to stay 200 until you have that many. This means that you can now throw away the rack if it is no longer perfect, either due to prolonged use or because you forgot to take it off before sliding it (high temperature). This box of 200 plastic mounts is way more than I thought it would be, way more than I expected, and way better than any alternative I've considered. A final note on plastics: I've tried metal frames. They were so tough they put holes in my shirts. I've found that it's better to have plastic racks and throw them away from time to time.
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