Inquiry about Soft Stretch Organic Cotton Blend T-shirts

I am interested in sourcing soft stretch organic cotton blend t-shirts (similar to Skims fabric). Details: Colours: Black, Gunmetal Grey, White, Natural; Sizes: XS – 5XL; Fabric: Organic cotton spandex preferred; Custom embroidery: Company name on each piece; Ethical sourcing required (confirm GOTS, OEKO - TEX, BSCI, SA8000 or other certifications). Questions: 1. Shipment time for samples and bulk orders? 2. Minimum Order Quantity (MOQ) per colour. What is the minimum for x4 colour options. Approximately 250 in stock by October would be amazing but a minimum 50 maximum 500 at this point.