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Quick answer
Smart casual is the standard. Majestic Pride's published terms say formal or smart casual and ban shorts, sleeveless t-shirts, flip-flops and sandals for men. Bally's visitors report smart casual too. Other venues have no written policy we could find.
By venue
| Venue | Dress code | Source |
|---|---|---|
| Majestic Pride | Formal or smart casual. Men: no shorts, sleeveless t-shirts, flip-flops or sandals | Venue terms |
| Bally’s Colombo | Smart casual; avoid shorts and slippers | Traveller reports (unofficial) |
| City of Dreams | Not yet confirmed | No policy found |
| Bellagio | Not yet confirmed | No policy found |
| Casino Marina | Not yet confirmed | No policy found |
Other rules to know
- Majestic Pride bans large bags, laptops, cameras and recording devices on the gaming floor, and offers lockers at reception.
- Bring a passport (foreign visitors) or government photo ID.
- Entry may be refused to guests who appear drunk.
Frequently asked questions
Can I wear shorts or slippers?
Not at Majestic Pride (men: no shorts, flip-flops or sandals). Bally's reviewers also advise against shorts and slippers, although one says nobody is stopped. Wear long trousers and closed shoes to be safe.
Can I just look around without playing?
Bally's reviewers say you register at the front desk with your passport, get a free casino card and can walk the floor. This is unofficial (not yet confirmed).
Can I take photos inside?
No photography or videography on the gaming floors at Majestic Pride. Assume the same elsewhere.
Sources

Alston Antony, Founder & Editor, Sri Lankan local. Part of Casino Entry Guides for Sri Lanka.