Do you carry a plain sweatshirts?

It depends on their stock.

I believe they do.

The stock is different all the time. Call or go by to see.

Sometimes they do, yes. They don't have the same stock all the time, though, so you'd probably be best if calling and asking or stopping by to see.

Not seen them when I've shopped there, but they seem to change up their inventory often, so it could be I've missed seeing them

I've never seen any plain ones

No

I've never seen any there.

I don't work there.