| Document and Entity Information | Mar. 29, 2022 |
| Cover [Abstract] | |
| Entity Registrant Name | Lulu's Fashion Lounge Holdings, Inc. |
| Amendment Flag | false |
| Entity Central Index Key | 0001780201 |
| Document Type | 8-K |
| Document Period End Date | Mar. 29, 2022 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-41059 |
| Entity Tax Identification Number | 20-8442468 |
| Entity Address, Address Line One | 195 Humboldt Avenue |
| Entity Address, City or Town | Chico |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95928 |
| City Area Code | (530) |
| Local Phone Number | 343-3545 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.001 per share |
| Trading Symbol | LVLU |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
