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ladies underwear sewing pattern, basic and lace bottom (not in english but great reference for lingerie patterns and learn to sew different clothing and under garments

КАК СШИТЬ БЮСТГАЛЬТЕР

Кройка и шитьё.

This looks like a bra pattern but I think it could be used to create a style bathing suit

Pattern bra.

Шитье и моделирование одежды

(Again, foundation for a gown under which you cannot or do not want to wear an additional undergarment.