How to decide: a verdict for each situation
The verdicts assume a B2B buyer in Armenia or the wider EAEU with production already sourced externally. Where the answer depends on a fact the buyer holds, that fact is named.
Keep design in-house when the identity is stable and the volume is steady. Brand consistency is the asset, and the organisation already pays for the context. Give the designer the process constraints as standing brief material, not as a request to be answered per project.
Outsource design when the artwork is being engineered for a process. Anything at high volume with a colour count, a minimum line weight and a garment to fit is production design rather than brand design, and it is cheaper to buy from someone who does it daily than to learn it once.
Use an external studio for anything with a hard deadline. The turnaround is not the issue. The issue is that a studio will tell you before the artwork is approved that something cannot be done, and that warning is worth more than the speed of an internal turnaround that delivers an unachievable file.
Require an archived production master from either model. Outlines converted, colours stated as references, position dimensions and clearances written down, minimum sizes noted. Without that file the design cannot be reprinted accurately, and every future order restarts the argument.
Never let a designer approve artwork without a production check. In-house or external, the rule is the same: no artwork goes to a supplier without a preflight against the intended method and substrate. The check takes minutes and catches most of what matters.
Split by design type rather than by supplier. Identity marks stay with the person who holds the brand. Production adaptations, product-range artwork and anything engineered for a decoration method go to the studio. Trying to make one relationship cover both is where quality drops.
Buy the specification even when you buy the artwork in-house. The documentation is what protects the brand on the garment. Writing it costs an afternoon and it makes every later order, in-house or outsourced, cheaper and faster.