Short answer — two good routes:

1. Buy from the Malaysian runway designers (closest match)

• Many looks at Kuala Lumpur Fashion Week included bright yellow and polka‑dot motifs (e.g., Brian Khoo’s show). To get the exact runway pieces or commissioned / made‑to‑measure versions, contact the designers directly (Brian Khoo, Rizman Ruzaini and other KLFW names) via their official sites/press pages or their showrooms. (firstclasse.com.my)

2. Ready‑to‑wear (ships to the U.S., quick)

• ASOS: carries yellow polka‑dot dresses and tops in a range of prices and often ships to the U.S. (good for “runway‑inspired” pieces). (asos.com)
• Zara: regularly stocks polka‑dot dresses and often has seasonal yellow/bright variants — check Zara US/Zara online. (zara.com)
• Anthropologie / Nordstrom / Revolve: sell elevated and vintage‑inspired yellow polka‑dot dresses and blouses (good if you want higher‑quality RTW). (Examples available via their product listings and resale channels.) (anthropologie.com)

3. Malaysian e‑commerce / regional marketplaces (if you want authentic Malaysian labels)

• Lazada / Zalora and other SEA marketplaces list many polka‑dot pieces and carry local brands; some sellers offer international shipping or you can use a parcel‑forwarder. (Good if you want Malaysian labels or more direct runway‑inspired items.) (lazada.com.my)

4. Budget / trend copies

• Fast‑fashion sites (Zaful, Shein, Amazon) have many yellow polka‑dot styles at low prices if you want the look for a single event. (Expect variable quality and sizing.) (zaful.com)

Quick tips to match the runway look

• Identify the silhouette (maxi, midi, mini, suit, two‑piece) and the dot size (micro vs jumbo) — that narrows searches.
• Use search phrases like “yellow polka dot dress midi” or “mustard polka dot blouse” and filter by material/length.
• For an exact runway replica, save runway photos and email the designer/atelier — many Malaysian designers take bespoke orders or can direct you to stockists. (mbfw-kl.com)

If you want, I can:

• Search for specific yellow polka‑dot pieces in your size/budget from the sites above, or
• Try to locate the exact runway look if you can paste (or describe) a photo or the designer name.

Which would you prefer?