Hello I'm looking for a few tips on how to ship to FBA.

We managed about 4500 SKU'S since we sell clothing (Underwear) that comes in Different sizes and Colors

I have notice significant delays on shipments when we send multiple Styles and Colors at a time. also it seems the amount of items per shipment imapact their ability to properly received the items. So far we have lost quite a number of items due to Amazon inability to properly received the items. this are very small items 6 x 4 x 0.2 and we can pack a lot in one small box. every item is identified by Manufacture UPC and we are Brand owners.

So my question specially for those in the clothing realm.

- How many items at a time shoudl we send?

- how many Styles and Colors or just keep it simple to One Style and 4 - 5 Colors at a time?

- Any additional tips or helps would be appreciated.