We can give you estimates even on a broad product type with total quantities as long as the products are defined at category level.
For example -we can give a broad estimate of men's round neck t-shirt - 3000 pcs from our factory in India to a warehouse in Dallas Texas (US).
However, these estimates would be based on standard sizes. If your brand has a plus size or if it's not US adult male but female or kids or teens clothing - the estimates will differ by a significant margin