For a Pakistan-based apparel store, I wouldn't put the whole budget into one channel at the start. I'd test 2–3 channels with small budgets and compare actual purchases rather than just clicks.
Meta Ads would probably be one of the first channels I'd test because varsity jackets are a visual product. Short videos showing the jackets being worn, different styling options, and real customer photos can work better than simple product images.
I'd also work on SEO for longer-term traffic. Target specific searches around varsity jackets, custom jackets, university jackets, and city-based searches instead of only trying to rank for a broad keyword.
For Pakistan, I'd also pay attention to city-level performance. Karachi, Lahore, Islamabad/Rawalpindi and other major urban areas may behave quite differently in terms of demand, delivery and purchasing behaviour.
One thing I'd definitely set up from day one is tracking for product views, add-to-carts and purchases. That makes it much easier to see whether a channel is actually producing customers instead of just sending traffic.
I'd start small, let the data show which audience and creative works, and then put more budget into the combinations that are generating actual sales.